| absinthol | An oily liquid that is a constituent of several essential oils, notably oil of wormwood; = thujone… | 1872 | Go To Quotation |
| acetolysis | The decomposition of a compound by the action of acetic acid; simultaneous acetylation and hydrolysis. | 1911 | Go To Quotation |
| acetophenone | A yellow, sweet-smelling liquid which crystallizes just below room temperature, used… | 1871 | Go To Quotation |
| aconine | An amorphous alkaloid with a polycyclic molecule, obtained by hydrolysis of… | 1878 | Go To Quotation |
| acridone | A crystalline heterocyclic compound which forms the basis of various biologically and pharmacologically active substances. | 1892 | Go To Quotation |
| acrylamide | The amide of acrylic acid, a colourless crystalline solid which readily yields water-soluble polymers. | 1893 | Go To Quotation |
| acylation | The introduction of one or more acyl groups into a compound or molecule; an instance of this. | 1898 | Go To Quotation |
| adenyl | A group or radical derived from adenine by the loss of one hydrogen atom. Freq. attrib. or… | 1889 | Go To Quotation |
| adenylate | A salt or ester of adenylic acid. | 1925 | Go To Quotation |
| adonitol | = ribitol n. | 1893 | Go To Quotation |
| albuminone | A product of the partial digestion of protein by pancreatic enzymes; a peptone. Cf. albuminose n. | 1874 | Go To Quotation |
| aldo- | an oxime having the structure RCH=NOH, where R is an alkyl group, formed by reaction of… | 1883 | Go To Quotation |
| alkoxy- | Forming the names of compounds, groups, etc., containing an alkoxyl group —OR, in which… | 1888 | Go To Quotation |
| alkyl | Any of the series of hydrocarbon groups or radicals derived from alkanes by the removal… | 1879 | Go To Quotation |
| allactite | A rare reddish-brown or pink mineral consisting of a basic arsenate of… | 1884 | Go To Quotation |
| allene | = propadiene n. | 1875 | Go To Quotation |
| alliin | A substance found in garlic, originally thought to be a glucoside (see quot. 1910). Now disused. | 1910 | Go To Quotation |
| allo- | Chem. Prefixed to the name of an organic substance to denote another substance isomeric… | 1886 | Go To Quotation |
| amylase | An enzyme or organic catalyst which disintegrates starch, present in animals and plants; = diastase n. | 1893 | Go To Quotation |
| amylopectin | A mucilaginous constituent of starch. | 1905 | Go To Quotation |
| amyrin | A resin obtained from a Mexican species of Amyris (A. elemifera). | 1876 | Go To Quotation |
| andromedotoxin | A poisonous crystalline substance found in various ericaceous plants, esp. the genus Andromeda. | 1883 | Go To Quotation |
| anionotropy | Tautomerism characterized by the movement of an anion. | 1928 | Go To Quotation |
| antipyrin | The commercial name of a benzene derivative, C 11 H 12 N 2 O, used as an… | 1884 | Go To Quotation |
| arginine | An amino-acid, C 5 H 13 N 4 COOH, present in many animal proteins and certain vegetable tissues. | 1886 | Go To Quotation |
| aspergillin | A black pigment found in the spores of various species of Aspergillus. | 1891 | Go To Quotation |
| aspirin | A white crystalline compound, acetylsalicylic acid, used esp. as an analgesic and… | 1899 | Go To Quotation |
| asymmetric | Chem. Exhibiting, pertaining to, or affected by asymmetry (sense 2b); = stereo-isomeric adj.… | 1875 | Go To Quotation |
| aurantia | An orange-yellow dye colour; see also quot. 1940. | 1877 | Go To Quotation |
| autolysis | The destruction of cells or tissues by enzymes present within them, occurring after death or as part of a pathological process. | 1900 | Go To Quotation |
| autolytic | Of, relating to, or of the nature of autolysis; causing autolysis; undergoing or affected by autolysis. | 1900 | Go To Quotation |
| autoradiogram | = autoradiograph n. | 1924 | Go To Quotation |
| Avogadro | Used esp. attrib. or in the possessive case of Avogadro's hypothesis that equal volumes… | 1871 | Go To Quotation |
| azoxy | Defining a compound consisting of an azo-group into which an oxygen atom has been introduced. | 1873 | Go To Quotation |
| azulene | A liquid hydrocarbon, blue in colour, found in some volatile oils; = cerulein n. | 1874 | Go To Quotation |
| bastose | = lignocellulose adj. at ligno- comb._form Affix. Also attrib. | 1882 | Go To Quotation |
| betafite | A niobate and titanate of uranium, etc. | 1912 | Go To Quotation |
| biguanide | A colourless crystalline compound which is a condensation product of two guanidine… | 1881 | Go To Quotation |
| bilirubin | A reddish pigment, C 33 H 36 O 6 N 4, occurring in bile. Also attrib. | 1871 | Go To Quotation |
| bis- | Chem. Used in the names of compounds to signify two identical groups substituted in the same way. | 1931 | Go To Quotation |
| bröggerite | A thorian variety of uraninite. | 1884 | Go To Quotation |
| brunsvigite | A type of oxidized chlorite occurring in gabbro in the Radauthal, Germany; spec. one… | 1902 | Go To Quotation |
| bufotenine | A hallucinogenic tryptamine alkaloid that produces vasoconstriction and hypertension… | 1902 | Go To Quotation |
| butane | Butyl hydride, C 4 H 10; = tetrane n. Also attrib. and Comb. | 1875 | Go To Quotation |
| butenyl | Any of the three isomeric forms of the radical C 4 H 7 —, of which the two normal butylenes are hydrides. | 1881 | Go To Quotation |
| cannabinol | A crystalline phenol, C 21 H 26 O 2, obtained from cannabis resin. | 1896 | Go To Quotation |
| carbazole | A rather unreactive, crystalline, heterocyclic compound occurring in coal tar and as… | 1872 | Go To Quotation |
| carbonium | Originally: an organic radical or ion bearing a positive or negative charge on a carbon… | 1902 | Go To Quotation |
| carboxylase | Any of various enzymes that bring about a decarboxylation reaction, liberating… | 1911 | Go To Quotation |
| catechol | C 6 H 6 O 2, produced by the dry distillation of catechu, kino, and other substances… | 1880 | Go To Quotation |
| cationic | Of, relating to, or consisting of cations. | 1928 | Go To Quotation |
| celtium | An element now generally known as hafnium n. | 1911 | Go To Quotation |
| cerulignol | A colourless oily phenolic liquid, C 10 H 14 O 2, which has astringent properties and… | 1883 | Go To Quotation |
| chalcone | A pale yellow crystalline ketone, 1,3-diphenyl-2-propen-1-one, C 6 H 5 CH=CHC(O)·C 6 H… | 1899 | Go To Quotation |
| chemisorption | Adsorption in which the adsorbed substance is held to a surface by chemical bonds, as… | 1933 | Go To Quotation |
| chloramine | any derivative of a sulphonamide in which one or both of the hydrogen atoms in the amide… | 1893 | Go To Quotation |
| chlorocresol | Any of various chlorine derivatives of cresols; esp. the derivative C 7 H 7 ClO… | 1886 | Go To Quotation |
| chondroitic | (see quot. 1944). | 1885 | Go To Quotation |
| chromotropic | Having the property of varying its colour. | 1899 | Go To Quotation |
| cinch- | Variant of cincho- comb._form used before vowels, as in cinchaine, cinchamidine, cinchene, cincholine (see quots.). | 1881 | Go To Quotation |
| cinchon- | in names of alkaloids derived from cinchona. Cf. cinchonamine n. at cinchona n. Derivatives, cinchonine n., etc., | 1879 | Go To Quotation |
| cinene | A terpene derived from cineol. | 1884 | Go To Quotation |
| cineole | A volatile compound, C 10 H 18 O, occurring in oil of cajeput, various eucalyptus oils, and other oils. | 1885 | Go To Quotation |
| citrazinic | Designating a crystalline hydroxy acid, formed by condensation from an amide of citric acid. | 1885 | Go To Quotation |
| citrometer | An instrument used for determining the specific gravity of lemon juice in the preparation of citric acid. | 1875 | Go To Quotation |
| codamine | A crystalline phenolic alkaloid, C 20 H 25 NO 4, present in opium in small quantities. | 1871 | Go To Quotation |
| coriandrol | A colourless liquid, C 10 H 18 O, obtained esp. from oil of coriander and oil of linaloe. | 1891 | Go To Quotation |
| coumarone | A colourless liquid, C 8 H 6 O, which may be distilled from coal-tar or synthesized, and… | 1883 | Go To Quotation |
| cycloheptane | A flammable liquid cyclic hydrocarbon used as a solvent and synthetic intermediate… | 1897 | Go To Quotation |
| cyclopentadiene | A liquid unsaturated cyclic hydrocarbon, C 5 H 6, that is formed as a by-product of… | 1896 | Go To Quotation |
| cylindrite | A blackish-grey sulphide of lead, antimony, and tin, known only from Bolivia. | 1893 | Go To Quotation |
| cysteine | An amino-acid, HS·CH 2 ·CH(NH 2)·COOH, which is a reduction product of cystine and… | 1884 | Go To Quotation |
| cytidine | A nucleoside, C 9 H 13 N 5 O 5, composed of cytosine and ribose and obtained by the hydrolysis of ribonucleic acid. | 1911 | Go To Quotation |
| delafossite | A black oxide of iron and copper, CuFeO 2, found chiefly in crystalline form or as botryoidal crusts. | 1873 | Go To Quotation |
| denitrification | The reduction, esp. by bacteria, of simple inorganic nitrogen compounds; spec. the… | 1883 | Go To Quotation |
| deoxy- | Used in forming the names of chemical compounds, indicating the loss of one or more… | 1871 | Go To Quotation |
| dewindtite | A hydrated basic phosphate of lead and uranium (see also quot. 1956). | 1922 | Go To Quotation |
| diacetylmorphine | An acetyl derivative of morphine, more commonly called heroin n. (Cf. diamorphine n.) | 1875 | Go To Quotation |
| diamidine | Any compound having a structure based on two amidine, −C(NH) (NH 2), groups; usually… | 1931 | Go To Quotation |
| diazomethane | An aliphatic diazo compound, CH 2 N 2, a poisonous yellow gas used as a methylating agent. | 1894 | Go To Quotation |
| dibenzanthracene | Any of several hydrocarbon derivatives of anthracene with a molecular structure consisting… | 1918 | Go To Quotation |
| dicoumarin | Orig., any compound with a structure based on two coumarin molecules joined… | 1886 | Go To Quotation |
| digoxin | A crystalline glycoside, C 41 H 64 O 14, obtained from the leaves of the… | 1930 | Go To Quotation |
| dihydroxyacetone | A colourless crystalline compound, CH 2 OH·CO·CH 2 OH, isomeric with glyceraldehyde and having strong reducing properties. | 1895 | Go To Quotation |
| diketone | Any compound in which there are two carbonyl groups, ——CO——, each attached to two carbon atoms. | 1896 | Go To Quotation |
| dionine | Ethylmorphine hydrochloride, used in the treatment of glaucoma, iritis, etc., and to alleviate coughing. | 1899 | Go To Quotation |
| dioxan | Any of three liquids, C 4 H 8 O 2, with a molecular structure consisting of a saturated… | 1912 | Go To Quotation |
| dipeptide | Any compound composed of two amino-acid residues linked by a peptide bond. | 1903 | Go To Quotation |
| dopa | 3,4-Dihydroxyphenylalanine, C 9 H 11 NO 4, a crystalline amino-acid which occurs naturally… | 1917 | Go To Quotation |
| -ein | variants of -in suffix and -ine suffix used as suffixes in the names of certain… | 1871 | Go To Quotation |
| ekdemite | A yellow oxychloride of lead and arsenic, of uncertain formula, found in Sweden and the U.S.A. | 1879 | Go To Quotation |
| enantiomerism | The property of a compound of occurring as enantiomers. | 1925 | Go To Quotation |
| enantiotropy | The existence of two stable polymorphs of a substance which at a certain transition temperature are interconvertible. | 1900 | Go To Quotation |
| Eötvös | Used attrib. or in the possessive to designate certain apparatus invented and principles enunciated by Eötvös. | 1913 | Go To Quotation |
| epimerization | The conversion of one epimer into the other. | 1929 | Go To Quotation |
| epinephrine | = adrenaline n. | 1899 | Go To Quotation |
| erepsin | Name given to a mixture of enzymes in the intestinal juice. | 1902 | Go To Quotation |
| ergosterol | A steroid alcohol, C 28 H 44 O, present esp. in ergot and in many yeasts and fungi… | 1889 | Go To Quotation |
| erythritol | A tetrahydric alcohol, 1,2,3,4-butanetetraol, occurring chiefly in lichens and algæ, and obtainable by reduction of erythrose. | 1891 | Go To Quotation |
| erythrol | = erythritol n. | 1879 | Go To Quotation |
| ethanol | = ethyl alcohol n. at ethyl n. Compounds. | 1900 | Go To Quotation |
| ethanolamine | Any of three compounds in which one or more of the hydrogen atoms in ammonia is replaced by… | 1897 | Go To Quotation |
| ethenoid | Resembling ethylene in structure or properties; ethylenic. | 1907 | Go To Quotation |
| ethoxyl | The radical CH 3 CH 2 O— in organic compounds. Usu. attrib. | 1866 | Go To Quotation |
| europium | A soft, silvery-white chemical element, atomic number 63, which is a rare earth metal of the lanthanide series. Symbol Eu. | 1901 | Go To Quotation |
| factice | Any of several friable rubber-like substances made by vulcanizing unsaturated vegetable… | 1896 | Go To Quotation |
| farnesol | A terpenoid alcohol, C 15 H 25 OH, that occurs in various essential oils and is used in the preparation of scents. | 1904 | Go To Quotation |
| Fehling | Used attrib. or in the possessive to designate an alkaline solution of cupric sulphate… | 1873 | Go To Quotation |
| fenchane | A liquid that is chemically a saturated bicyclic hydrocarbon of the terpene series, C 10 H… | 1907 | Go To Quotation |
| fenchene | Any of several isomeric unsaturated terpenes, C 10 H 16, that are related to fenchane and are isolated as oily liquids. | 1891 | Go To Quotation |
| fenchone | An oily liquid with a camphor-like smell which occurs naturally in two enantiomorphic… | 1891 | Go To Quotation |
| flinkite | A basic arsenate of manganese known only as greenish-brown crystals from Sweden. | 1891 | Go To Quotation |
| fluorescin | A compound formed by the reduction of fluorescein. | 1871 | Go To Quotation |
| fluorindine | Any of a class of heteroaromatic compounds derived from indulines, many of which show… | 1890 | Go To Quotation |
| fluorol | Chem. A hydroxy derivative of fluorene. Obs. | 1883 | Go To Quotation |
| fluorophore | Any group of atoms whose presence in a molecule causes the molecule to be fluorescent. | 1898 | Go To Quotation |
| formaldehyde | A choking gas, CH 2 O, usually prepared as an aqueous solution, and used as a… | 1872 | Go To Quotation |
| furanoside | Any glycoside in the furanose form. | 1932 | Go To Quotation |
| furfuran | = furan n. | 1877 | Go To Quotation |
| gadolinium | A metallic element of the lanthanide series which is present in monazite, gadolinite… | 1886 | Go To Quotation |
| galactan | Any of a class of polysaccharides which are composed of a chain of galactose residues, and which yield galactose on hydrolysis. | 1886 | Go To Quotation |
| galactitol | A crystalline alcohol produced by reduction of galactose and found in many plants. Also called dulcitol. | 1896 | Go To Quotation |
| galactonic | a crystalline acid derived from galactose by oxidation of the aldehyde group to a carboxyl group. | 1885 | Go To Quotation |
| galenobismutite | A sulphide of lead and bismuth usu. occurring as light grey columnar or fibrous masses. | 1880 | Go To Quotation |
| galipine | An alkaloid, C 20 H 21 NO 3, obtained from Angustura bark. | 1884 | Go To Quotation |
| galipoidine | An alkaloid, C 19 H 15 NO 4. | 1911 | Go To Quotation |
| gallacetophenone | A yellow crystalline compound, C 6 H 2 (OH) 3 COCH 3, formerly used in ointments for skin-diseases and as a mordant dye-stuff. | 1881 | Go To Quotation |
| gallanilide | An anilide of gallic acid, C 6 H 2 (OH) 3 ·CONH·C 6 H 5, used in the manufacture of some dyes. | 1883 | Go To Quotation |
| gallein | A brown-red powder, or small green crystals, obtained by heating pyrogallol and phthalic anhydride. Used as a dye. | 1871 | Go To Quotation |
| gallisin | An amorphous unfermentable substance obtained from commercial glucose, now regarded as a mixture. | 1884 | Go To Quotation |
| Ge | The element germanium. | 1886 | Go To Quotation |
| genistein | An isoflavone derivative, C 15 H 10 O 5, that is present in dyer's broom, Genista tinctoria… | 1900 | Go To Quotation |
| geranial | A fragrant colourless oil present in many essential oils (as lemon-grass oil) and… | 1899 | Go To Quotation |
| geraniol | A colourless oil with a fragrance of roses that is present in many essential oils (as… | 1871 | Go To Quotation |
| germanic | Of or containing germanium in the quadrivalent state. | 1886 | Go To Quotation |
| globulose | Any of a class of proteins (the proteoses) formed by the decomposition of a globulin by the action of pepsin. | 1886 | Go To Quotation |
| Glover | Glover (†Glover's) tower: in the chamber process for the manufacture of sulphuric acid… | 1871 | Go To Quotation |
| glucase | = maltase n. | 1894 | Go To Quotation |
| gluco- | (a) any of various amino acids or mixtures of amino acids to which were ascribed… | 1879 | Go To Quotation |
| gluconic acid | The acid derived from glucose by oxidation of the aldehyde group to a carboxyl group. | 1871 | Go To Quotation |
| glucosamine | Any amino-sugar derived from glucose by substitution of an amino group for a… | 1884 | Go To Quotation |
| glucosidase | Any enzyme that hydrolyses a glucoside, thereby producing glucose; freq. with… | 1909 | Go To Quotation |
| glyceraldehyde | A colourless, sweet-tasting, crystalline compound, CHO·CHOH·CH 2 OH, which is the simplest optically active sugar. | 1882 | Go To Quotation |
| glycolysis | An important metabolic process, the initial pathway in cell respiration, in which… | 1892 | Go To Quotation |
| glycosamine | Any amino-sugar in which the amino group replaces a hydroxyl group other than that attached to the first carbon atom. | 1877 | Go To Quotation |
| glycuronic | = glucuronic acid n. | 1882 | Go To Quotation |
| glycyl | The univalent radical NH 2 ·CH 2 ·CO— derived from glycine. | 1901 | Go To Quotation |
| glycyrrhetic | a triterpene, the aglycone of glycyrrhizic acid. | 1907 | Go To Quotation |
| glycyrrhizic | a glycoside obtained from liquorice root. | 1879 | Go To Quotation |
| glyoxime | Any of the dioximes of the α-diketones. | 1895 | Go To Quotation |
| Grignard | Used attrib. and in the possessive to designate organometallic compounds of… | 1904 | Go To Quotation |
| grünlingite | A sulphide and telluride of bismuth, similar to or identical with joseite, which occurs in steel-grey lamellar masses. | 1898 | Go To Quotation |
| guanase | An enzyme that hydrolyses guanine to xanthine and ammonia; guanine aminohydrolase, guanine deaminase. | 1904 | Go To Quotation |
| guanidino- | Combining form of guanidine n. So guanidino acid, guanidino group, etc. | 1910 | Go To Quotation |
| guanido- | = guanidino- comb._form. So guanido group. | 1874 | Go To Quotation |
| gulose | An artificial hexose sugar, C 6 H 10 O 6, which is stereoisomeric with glucose. | 1891 | Go To Quotation |
| guvacine | A white crystalline alkaloid, C 6 H 9 NO 2, obtained from the areca nut. | 1891 | Go To Quotation |
| hackmanite | A pink or reddish violet variety of sodalite which loses its colour when exposed to daylight but regains it in the dark. | 1903 | Go To Quotation |
| haemerythrin | A red respiratory pigment in the blood of certain invertebrates. | 1903 | Go To Quotation |
| hauchecornite | A bronze-coloured sulphide of nickel, bismuth, and antimony, Ni 9 (Bi,Sb) 2 S 8. | 1893 | Go To Quotation |
| helmitol | A proprietary name of a derivative of hexamethylenetetramine that has been used as… | 1903 | Go To Quotation |
| hemicellulose | Any of various non-cellulosic polysaccharides, of simpler composition than cellulose… | 1891 | Go To Quotation |
| hentriacontane | A hydrocarbon of the paraffin series, C 31 H 64, esp. the solid unbranched hydrocarbon CH… | 1887 | Go To Quotation |
| heumite | A brownish-black hypabyssal dike-rock containing alkali feldspars, biotite, and… | 1901 | Go To Quotation |
| hexitol | Any of a class of hexahydric alcohols that are closely related to the hexoses. | 1894 | Go To Quotation |
| hexone | In full, hexone base: any of the three basic amino-acids arginine, histidine, and lysine. | 1898 | Go To Quotation |
| hieratite | A colourless or greyish fluoride of potassium and silicon, K 2 SiF 6, occurring… | 1882 | Go To Quotation |
| hintzeite | = heintzite n. | 1891 | Go To Quotation |
| histidine | An amino acid with a basic, cyclic side chain, which is found in many proteins, often as… | 1896 | Go To Quotation |
| histone | Any of a class of small basic proteins which are found in association with DNA in… | 1885 | Go To Quotation |
| hohmannite | A hydrous basic ferrous sulphate, FeSO 4 (OH).3H 2 O, occurring in triclinic crystals… | 1888 | Go To Quotation |
| holmia | The sesquioxide of holmium, Ho 2 O 3, a pale yellow basic compound. | 1880 | Go To Quotation |
| homatropine | A synthetic alkaloid related to atropine, used mainly to dilate the pupil of the eye. | 1880 | Go To Quotation |
| homogentisic | a crystalline compound, C 8 H 8 O 4, which oxidizes to a black compound in air, is… | 1891 | Go To Quotation |
| humulene | A colourless liquid sesquiterpene, C 15 H 24, identical with α-caryophyllene and… | 1895 | Go To Quotation |
| humulone | A bitter, yellow, crystalline, cyclic ketone, C 21 H 30 O 5, that is an important… | 1916 | Go To Quotation |
| hydnocarpic | a crystalline alicyclic acid, C 5 H 7 ·(CH 2) 10 ·COOH, which in the form of its glycerides… | 1905 | Go To Quotation |
| hydnocarpus | a yellowish oil or soft cream-coloured fat obtained from the seeds of trees of… | 1905 | Go To Quotation |
| hydrazide | Any compound which may be represented as R·CO·NH·NH 2; also, any derivative of such a… | 1888 | Go To Quotation |
| hydrazino(-) | A combining form of hydrazine n., denoting the univalent radical NH·NH 2 (or a… | 1907 | Go To Quotation |
| hydrazo(-) | A combining form of hydrazine n., denoting the bivalent radical NH·NH (not linked to… | 1872 | Go To Quotation |
| hydrazone | Any compound which contains the group N·NH 2 (attached to a single carbon atom) and which… | 1888 | Go To Quotation |
| hydrogenase | Any enzyme which catalyses the addition of hydrogen to an organic substrate. | 1900 | Go To Quotation |
| hydrogenite | Either of two powders formulated to provide a convenient and portable means of… | 1908 | Go To Quotation |
| hydrolase | Any enzyme which catalyses the hydrolysis of a substrate. | 1922 | Go To Quotation |
| hydrolysable | Capable of being hydrolysed. | 1908 | Go To Quotation |
| hydronium | A name for the hydrated hydrogen ion (usu. represented as H 3 O +). | 1908 | Go To Quotation |
| hydroperoxide | Any compound containing the hydroperoxyl group, —O—OH; (in early use) spec. hydrogen peroxide, H—O—OH. | 1900 | Go To Quotation |
| hydrotropic | Physical Chem. Of, pertaining to, or produced by hydrotropy; causing a substance that… | 1916 | Go To Quotation |
| hydroxo- | A combining form of hydroxyl n., denoting a coordinated hydroxyl group; also used attrib. as an independent word. | 1907 | Go To Quotation |
| hydroxylation | The introduction of a hydroxyl group into a molecule or compound. | 1879 | Go To Quotation |
| hydroxylic | Of or containing a hydroxyl group. | 1898 | Go To Quotation |
| ibogaine | The principal alkaloid, C 20 H 26 N 2 O, of the shrub Tabernanthe iboga of equatorial… | 1902 | Go To Quotation |
| -idine | Used to form the names of many organic compounds containing nitrogen which, with few… | 1931 | Go To Quotation |
| ilsemannite | A black or dark blue secondary molybdenum mineral, perhaps a hydrated oxide of molybdenum, Mo… | 1871 | Go To Quotation |
| imidazole | Any of the derivatives of this compound. | 1892 | Go To Quotation |
| imidic | Of the nature of an imide; in mod. use applied to organic acids of the type R·C(NH)OH and their derivatives. | 1895 | Go To Quotation |
| imine | Any compound containing the group NH (or the substituted form NR) attached to one… | 1883 | Go To Quotation |
| incendivity | The ability to effect ignition or set on fire. | 1919 | Go To Quotation |
| indene | Any of the derivatives of this compound. | 1888 | Go To Quotation |
| indigoid | Of a dye: similar to indigotin in chemical structure, spec. in having another atom or… | 1908 | Go To Quotation |
| indoaniline | Any of the derivatives of this compound. | 1886 | Go To Quotation |
| indolyl | Any of the seven isomeric univalent radicals derived from indole by removal of a hydrogen atom; freq. as a word-forming element. | 1907 | Go To Quotation |
| invertase | = invertin n. | 1887 | Go To Quotation |
| iodimetry | The titrimetric analysis of an oxidizing or reducing agent using the iodine/iodide… | 1897 | Go To Quotation |
| iodization | The process or practice of iodizing; the addition of iodine or an iodine compound to a substance. | 1909 | Go To Quotation |
| iodonium | The name of cations of the type RR′I 2 + where R and R′ are (different or the same) alkyl… | 1894 | Go To Quotation |
| iodoso(-) | used in Chem. as comb. form of iodous adj. to indicate the presence of an IO group in… | 1892 | Go To Quotation |
| iodoxy(-) | a compound, C 6 H 5 IO 2, forming colourless needles and obtained by disproportionation of iodosobenzene. | 1865 | Go To Quotation |
| ionene | An oily liquid obtained on elimination of a water molecule from α- or β-ionone. | 1894 | Go To Quotation |
| irene | A colourless, liquid, bicyclic hydrocarbon, C 14 H 20, obtained by the dehydration of irone. | 1894 | Go To Quotation |
| irone | Orig., an essential oil obtained from orris-root; hence, any of the three isomers (α-irone, β-irone… | 1894 | Go To Quotation |
| isatoic | N -Carboxyanthranilic acid, C 6 H 4 (COOH) (NHCOOH), known only as its derivatives. | 1885 | Go To Quotation |
| isohydric | Physical Chem. Having the same hydrogen ion concentration; maintaining the same… | 1887 | Go To Quotation |
| johnstrupite | A brownish green hydrous silicate and fluoride of several metals. | 1890 | Go To Quotation |
| juglone | 5-Hydroxy-1,4-naphthoquinone, C 10 H 6 O 3, a reddish-yellow crystalline compound… | 1878 | Go To Quotation |
| kaersutite | A dark brown or black kind of hornblende characterized by a high titanium content and… | 1886 | Go To Quotation |
| kainosite | = cenosite n. | 1888 | Go To Quotation |
| keto- | an oxime of a ketone (i.e. any compound containing the group \ / C:NOH), formed by the action of hydroxylamine on a ketone. | 1888 | Go To Quotation |
| Kjeldahl | a method of estimation of nitrogen invented by Kjeldahl, in which the organic substance… | 1885 | Go To Quotation |
| koenenite | A hydroxide and chloride of magnesium, aluminium, and sodium (formerly thought to be… | 1902 | Go To Quotation |
| Kohlrausch | Kohlrausch's law: that the equivalent electrical conductivity of an electrolyte… | 1888 | Go To Quotation |
| Kolbe | Used attrib. and in the possessive to designate two syntheses devised by Kolbe: (a)… | 1885 | Go To Quotation |
| koswite | A coarse-grained peridotite consisting mainly of diopside, olivine, and magnetite. | 1901 | Go To Quotation |
| kynurenic | a crystalline carboxylic acid, C 10 H 7 NO 3, that results from the metabolism of… | 1872 | Go To Quotation |
| kyrine | Any of various basic substances or mixtures obtained by partial hydrolysis of proteins… | 1903 | Go To Quotation |
| lactam | Any of the class of cyclic amides analogous to the lactones, characterized by the group… | 1883 | Go To Quotation |
| lactoglobulin | The fraction of milk proteins which is obtained after the removal of casein and is… | 1885 | Go To Quotation |
| lactonic | = galactonic acid n. | 1871 | Go To Quotation |
| langbeinite | A sulphate of potassium and magnesium, K 2 Mg 2 (SO 4) 3, colourless when pure, which… | 1898 | Go To Quotation |
| laudanine | A colourless to pale red crystalline alkaloid contained in opium. | 1871 | Go To Quotation |
| laudanosine | Laudanine methyl ether, C 21 H 27 NO 4, the dextrorotatory form of which occurs in opium and is a strong tetanic poison. | 1871 | Go To Quotation |
| leonite | A hydrated sulphate of potassium and magnesium, K 2 Mg(SO 4) 2.4H 2 O, found… | 1897 | Go To Quotation |
| leptonology | (See quot. 1917.) | 1917 | Go To Quotation |
| ligroin | Any of various naphtha fractions with ranges of boiling points between 90 and 150°C, used as solvents. | 1881 | Go To Quotation |
| linalool | An optically active tertiary alcohol, (CH 3) 2 C:CH·CH 2 ·CH 2 ·C(CH 3)OH·CH:CH 2, found… | 1891 | Go To Quotation |
| lipase | Any enzyme which catalyses the hydrolysis of fats and oils to fatty acids and alcohols; esp. one present in the pancreatic juice. | 1897 | Go To Quotation |
| longifolene | A colourless, somewhat viscous oil that is present in the turpentine oil from some species… | 1920 | Go To Quotation |
| luminophore | A luminescent substance. | 1907 | Go To Quotation |
| lysine | An amino-acid, COOH·CH(NH 2)·(CH 2) 3 ·CH 2 NH 2, which is probably a constituent of all proteins. | 1892 | Go To Quotation |
| lyxose | A crystalline pentose sugar, C 5 H 10 O 5, which differs from xylose in the configuration… | 1896 | Go To Quotation |
| magnetochemical | Of or relating to magnetochemistry. | 1911 | Go To Quotation |
| maleimide | A cyclic imide, C 4 H 2 O 2 NH, of maleic acid. | 1904 | Go To Quotation |
| malolactic | Designating or relating to a secondary fermentation during which malic acid in wine is converted to lactic acid. | 1908 | Go To Quotation |
| malondialdehyde | The aldehyde, CH 2 (CHO) 2, of malonic acid, which occurs naturally as a breakdown… | 1904 | Go To Quotation |
| maltodextrin | Any of various oligosaccharides obtained by the partial hydrolysis of starch… | 1885 | Go To Quotation |
| maltol | A derivative of pyran occurring in larch bark, chicory, and in roasted malt, and used… | 1894 | Go To Quotation |
| mandelonitrile | A yellow oily liquid, C 6 H 5 CH(OH)CN, which is the nitrile of mandelic acid and of which amygdalin is a glucoside. | 1898 | Go To Quotation |
| mannan | Any of a group of polysaccharides that are composed chiefly of mannose residues and occur… | 1895 | Go To Quotation |
| Mannich | attrib. Designating or relating to the condensation reaction between a primary or… | 1931 | Go To Quotation |
| manno- | Forming the names of compounds and substances derived from or containing mannose, as mannoglycerate… | 1890 | Go To Quotation |
| mannonic | an organic acid, C 6 H 12 0 7, derived from mannose by the oxidation of the aldehyde group to a carboxyl group. | 1890 | Go To Quotation |
| maucherite | A tetragonal nickel arsenide, Ni 11 As 8, occurring as brittle, opaque… | 1913 | Go To Quotation |
| melibiose | A disaccharide crystalline sugar, C 12 H 22 O 11, consisting of one glucose and… | 1889 | Go To Quotation |
| menthol | A crystalline terpenoid alcohol found in peppermint and other natural oils, whose odour… | 1862 | Go To Quotation |
| menthyl | The radical or group C 10 H 19 O—, derived from menthol. Usu. attrib. | 1862 | Go To Quotation |
| mercapturic | any of various organic acids of the formula RSCH 2 CH(NH·CO·CH 3)COOH (where R is an aryl… | 1879 | Go To Quotation |
| meta | Chem. Now freq. italicized. Designating a configuration of a benzene ring in… | 1876 | Go To Quotation |
| metacresol | The meta isomer of cresol, used chiefly as a disinfectant and in the manufacture of plasticizers and resins. | 1875 | Go To Quotation |
| methacrylic | a colourless water-soluble compound, melting at 15–16°C, which readily polymerizes and is… | 1865 | Go To Quotation |
| methylmalonic | Chem. and Biochem. methylmalonic acid n. a dicarboxylic acid isomeric with succinic acid, (CH 3)CH(COOH) 2. | 1889 | Go To Quotation |
| Michler | the ketone corresponding to Michler's hydrol, made by treating phosgene or… | 1897 | Go To Quotation |
| microrespirometer | A device used to measure the respiration of microscopic organs or organisms, or… | 1905 | Go To Quotation |
| mixed crystal | A homogeneous crystal formed of more than one crystalline substance; a solid solution. | 1879 | Go To Quotation |
| molybdophyllite | A hydrous trigonal silicate of lead and magnesium occurring as colourless or pale green platy crystals. | 1901 | Go To Quotation |
| monoaxial | Relating to or having a single axis; occurring round or along one axis. | 1879 | Go To Quotation |
| monobrominated | Designating an organic compound in which one atom of bromine has been substituted in or added to each molecule. | 1862 | Go To Quotation |
| mononitro- | Forming the names of organic compounds containing one substituted —NO 2 radical. | 1850 | Go To Quotation |
| monoterpenoid | A compound that is either a monoterpene or a simple derivative of one. | 1954 | Go To Quotation |
| montan wax | A hard, brittle wax extracted from lignite or peat by means of organic solvents… | 1902 | Go To Quotation |
| mordenite | An orthorhombic hydrated silicate of aluminium, calcium, sodium, and potassium, which… | 1864 | Go To Quotation |
| morpholine | A cyclic amine, C 4 H 9 NO, which is a hygroscopic oil used as a solvent for resins and… | 1889 | Go To Quotation |
| mossite | A mineral originally regarded as a niobium-rich analogue of tapiolite (esp. as… | 1898 | Go To Quotation |
| muconic | a crystalline unsaturated dicarboxylic acid, (HOOC·CH:CH—) 2; 2,4-hexadienedioic acid. | 1873 | Go To Quotation |
| multirotation | = mutarotation n. | 1890 | Go To Quotation |
| mycoprotein | Biol. A protein formerly regarded as a principal constituent of the cytoplasm of certain bacteria. Obs. | 1880 | Go To Quotation |
| myoctonine | A poisonous diterpenoid alkaloid (perh. C 72 H 84 N 4 O 20), obtained from the wolfsbane Aconitum lycoctonum. | 1885 | Go To Quotation |
| myogen | Originally: a protein found in muscle-plasma, believed to be the soluble precursor of… | 1896 | Go To Quotation |
| myricetin | A flavonoid that is the aglycone (non-sugar component) of myricitrin; 3,5,7,3′,4′,5′-hexahydroxyflavone, C 15 H 10 O 8. | 1896 | Go To Quotation |
| myricitrin | A yellowish glycoside found in the bark of some species of Myrica; myricetin 3- O -rhamnoside, C 21 H 20 O 12. | 1902 | Go To Quotation |
| myristicene | The liquid component of the volatile oil of nutmeg. | 1872 | Go To Quotation |
| myristicol | The solid crystallizable component of the volatile oil of nutmeg. | 1872 | Go To Quotation |
| mytilotoxin | A poisonous alkaloid produced by certain planktonic organisms and sometimes present in mussels. | 1886 | Go To Quotation |
| naphthenate | Any of the salts or esters of a naphthenic acid, some of which are used as paint dryers, as fungicides, and in lubricants. | 1899 | Go To Quotation |
| naphthoquinone | Each of six isomeric compounds, C 10 H 6 O 2, notionally obtained by replacing two of… | 1870 | Go To Quotation |
| naphthyridine | Any of several isomers with the formula C 8 H 6 N 2 whose structure is that of naphthalene… | 1925 | Go To Quotation |
| naringin | A bitter flavonoid glucoside, C 27 H 32 O 14, of a tricyclic alcohol, which is found… | 1879 | Go To Quotation |
| Nd | The element neodymium. | 1885 | Go To Quotation |
| Ne | The element neon. | 1901 | Go To Quotation |
| nefedyevite | A white or pinkish aluminosilicate of magnesium and calcium belonging to the montmorillonite group. | 1873 | Go To Quotation |
| nephrotoxin | Originally: an antiserum produced by the injection of kidney tissue from one species… | 1902 | Go To Quotation |
| nerol | An oily unsaturated primary alcohol, C 10 H 18 O, which is present in neroli and… | 1903 | Go To Quotation |
| neuridine | A polyamine isolated from putrefying animal tissue; = spermine n. | 1884 | Go To Quotation |
| nicotinamide | The amide of nicotinic acid, (C 5 H 4 N)CONH 2, which is interconvertible with nicotinic… | 1895 | Go To Quotation |
| nicotinate | A salt or ester, or the anion, of nicotinic acid. | 1879 | Go To Quotation |
| nitramine | Any of a class of compounds containing the group \/NNO 2, some of which are used as propellants or explosives. | 1874 | Go To Quotation |
| nitron | A yellow crystalline triazole derivative, (C 6 H 5) 3 C 2 HN 4, which is used… | 1906 | Go To Quotation |
| nitrone | Any of a class of organic compounds having a dipolar molecule in which an oxygen atom is… | 1916 | Go To Quotation |
| nitrosamine | Any of a group of yellow oily compounds having the general formula RR′N—N=O (where R… | 1878 | Go To Quotation |
| non-electrolyte | A substance that is not an electrolyte. | 1891 | Go To Quotation |
| nonose | Any monosaccharide having nine carbon atoms in the molecule, esp. when these are all in an unbranched chain. | 1890 | Go To Quotation |
| nor- | a crystalline dicarboxylic acid, C 8 H 12 O 4, existing in cis and trans isomers… | 1909 | Go To Quotation |
| nordenskiöldine | A trigonal borate of calcium and tin, CaSnB 2 O 6, which occurs as colourless or yellow crystals. | 1890 | Go To Quotation |
| nucleic | any of a class of polymeric substances (polynucleotides) that carry genetic information… | 1892 | Go To Quotation |
| nuclein | Originally: protein that is rich in phosphorus, esp. nucleoprotein or… | 1871 | Go To Quotation |
| nucleon | A kind of nucleoprotein or phosphoprotein. | 1895 | Go To Quotation |
| nucleotide | Any compound consisting of, or containing, a nucleoside in which the sugar moiety is linked… | 1908 | Go To Quotation |
| octadecane | Any of the series of saturated hydrocarbons (alkanes) having the formula C 18 H 38; spec. (also n… | 1882 | Go To Quotation |
| octadecanol | Any of a number of saturated alcohols having the formula C 18 H 37 OH, of which many… | 1914 | Go To Quotation |
| octanoic | any saturated fatty acid of the formula C 7 H 15 COOH, of which several isomers exist; spec.… | 1909 | Go To Quotation |
| octanol | Any saturated aliphatic monohydric alcohol of the formula C 8 H 17 OH, of which many… | 1905 | Go To Quotation |
| octoate | A salt or ester of an octoic acid; = octanoate n. | 1911 | Go To Quotation |
| octose | Any monosaccharide having eight carbon atoms in the molecule, esp. when these are all in an unbranched chain. | 1890 | Go To Quotation |
| offretite | A mineral of the zeolite group which is a hydrated aluminosilicate of potassium and… | 1891 | Go To Quotation |
| oleoyl | The hydrocarbon radical —CH 3 (CH 2) 7 CH=CH(CH 2) 7 CH 2, derived from oleic acid; cis -9-octadecen-1-oyl. Usu. attrib. | 1903 | Go To Quotation |
| onium | attrib. Designating (compounds containing) complex cations of the kind with names ending in -onium. | 1905 | Go To Quotation |
| orcinol | A colourless crystalline phenol which is obtained from orchil and other lichens, turns… | 1880 | Go To Quotation |
| ornithine | A crystalline, basic amino acid synthesized in the body and involved in… | 1878 | Go To Quotation |
| orotate | A salt or ester, or the anion, of orotic acid. | 1905 | Go To Quotation |
| orotic | a crystalline acid which was discovered in milk and is an intermediate in… | 1905 | Go To Quotation |
| osazone | Any of a class of compounds (mostly yellow crystalline solids) whose molecules… | 1888 | Go To Quotation |
| oscine | A tropane alkaloid, C 8 H 13 N O 2, which is an isomer of scopine and a degradation… | 1892 | Go To Quotation |
| osmophoric | Of, relating to, or of the nature of an osmophore (in either sense). | 1901 | Go To Quotation |
| osone | Any of a class of compounds containing two adjacent carbonyl groups, typically obtained by hydrolysing osazones. | 1889 | Go To Quotation |
| otavite | A mineral of the trigonal system consisting of cadmium carbonate, CdCO 3, and occurring… | 1906 | Go To Quotation |
| ouabain | A cardiac glycoside, C 29 H 44 O 12, which is the active principle of the arrow poison… | 1888 | Go To Quotation |
| oviglobulin | = ovoglobulin n. | 1889 | Go To Quotation |
| oxaloacetic | Of or relating to oxaloacetic acid. oxaloacetic acid n. a dicarboxylic acid, HOOC·CO·CH… | 1896 | Go To Quotation |
| oxazole | Any of a class of compounds whose molecules contain a ring of one oxygen atom, one… | 1888 | Go To Quotation |
| oxidoreductase | Any enzyme that catalyses the simultaneous oxidation of one substrate and the reduction… | 1922 | Go To Quotation |
| oxo | Designating or containing a link consisting of a single oxygen atom between two other atoms. | 1921 | Go To Quotation |
| oxonium | The hydroxonium ion, H 3 O +; any analogue of this in which one or more of the hydrogen… | 1899 | Go To Quotation |
| paracasein | The form of casein produced when the protein in milk is coagulated by rennin, and… | 1896 | Go To Quotation |
| parachor | A numerical quantity (found empirically to be constant over a wide range of temperature)… | 1924 | Go To Quotation |
| paraffinoid | Of the nature of or resembling paraffin or a paraffin. | 1886 | Go To Quotation |
| paraformaldehyde | A white crystalline solid, obtained by the evaporation of an aqueous solution… | 1894 | Go To Quotation |
| paramylum | = paramylon n. | 1874 | Go To Quotation |
| pectinase | Any of a class of enzymes which hydrolyse pectin to its constituent monosaccharides… | 1899 | Go To Quotation |
| pellitorine | A toxic crystalline alkaloid obtained from the root of the pellitory, Anacyclus pyrethrum… | 1895 | Go To Quotation |
| pentameric | Of the nature of a pentamer; consisting of a pentamer or pentamers. | 1940 | Go To Quotation |
| pentose | A monosaccharide with five carbon atoms in its molecule (such as ribose and xylose). | 1890 | Go To Quotation |
| peracid | An acid which contains a peroxide group, esp. (in organic chemistry) the group —CO·O·OH. | 1900 | Go To Quotation |
| perbenzoic | a colourless, crystalline solid, C 6 H 5 CO·O·OH, which is an oxidizing agent used esp. for epoxidation reactions. | 1903 | Go To Quotation |
| perchloroethylene | A colourless, non-flammable, toxic liquid, C 2 Cl 4, which is widely used as a solvent… | 1873 | Go To Quotation |
| peroxy- | Prefixed to the names of chemical compounds. | 1878 | Go To Quotation |
| peroxynitrate | A nitrate containing a higher proportion of oxygen than the simple nitrate; spec.… | 1896 | Go To Quotation |
| perylene | A yellow, crystalline hydrocarbon, C 20 H 12, whose molecule consists of five… | 1910 | Go To Quotation |
| pH | A number expressing the acidity or alkalinity of a solution (or of a medium containing… | 1909 | Go To Quotation |
| phaeophytin | A brownish or grey-green compound formed by the degradation of chlorophyll (e.g. by weak acid… | 1907 | Go To Quotation |
| phenanthrene | A white crystalline hydrocarbon, C 14 H 10, which has a tricyclic molecule consisting… | 1873 | Go To Quotation |
| phenanthridine | A crystalline heteroaromatic compound, C 13 H 9 N, which has the tricyclic molecular… | 1890 | Go To Quotation |
| phenanthroline | Each of a number of isomeric, crystalline, heteroaromatic compounds having the formula C 12 H… | 1882 | Go To Quotation |
| phenazone | Chem. A crystalline, tricyclic, heteroaromatic compound; 9,10-diazaphenanthrene, C 12 H 8 N 2. Now rare. | 1893 | Go To Quotation |
| phenazoxine | = phenoxazine n. | 1887 | Go To Quotation |
| phenolphthalein | A crystalline solid, C 20 H 14 O 4, which is the simplest phthalein and is used… | 1875 | Go To Quotation |
| phenosafranine | A synthetic red azo dye, used in photography as a… | 1883 | Go To Quotation |
| phenoxide | A salt of phenol, containing the anion C 6 H 5 O −. Also: a compound containing a phenoxy… | 1888 | Go To Quotation |
| phenylalanine | A hydrophobic amino acid which occurs in many plant proteins and is an essential… | 1883 | Go To Quotation |
| phenylpyruvic | a colourless crystalline acid, C 6 H 5 CH 2 CO(COOH), which is a product… | 1887 | Go To Quotation |
| phloroglucinol | A colourless or yellowish, sweet-tasting, crystalline phenolic compound which occurs… | 1879 | Go To Quotation |
| phosphazine | Any compound containing an azine group =N—N= bonded directly to a phosphorus atom. Cf. phosphazene n. | 1920 | Go To Quotation |
| phosphodiester | A compound having the formula RO—PO(OH)—OR′, where R and R′ are usually nucleoside… | 1952 | Go To Quotation |
| photocatalyse | trans. To bring about photocatalysis of (a reaction, etc.). | 1921 | Go To Quotation |
| phthalaldehyde | Each of three isomeric compounds with the formula C 8 H 6 O 2, having two formyl… | 1886 | Go To Quotation |
| phytase | Any of a class of enzymes found esp. in cereals and yeast which convert phytic acid to myo -inositol and phosphoric acid. | 1908 | Go To Quotation |
| phytol | A long-chain terpenoid alcohol, C 20 H 40 O, that is a colourless oil obtained by… | 1907 | Go To Quotation |
| phytosterol | Any sterol which is found in plant tissues (at first supposed to represent a single distinct substance analogous to cholesterol). | 1898 | Go To Quotation |
| phytyl | The monovalent radical —OC 20 H 39, derived from phytol by the loss of a hydrogen… | 1911 | Go To Quotation |
| picrolichenic | a very bitter, crystalline, polycyclic acid, C 25 H 30 O 7, isolated from the lichen Pertusaria amara. | 1902 | Go To Quotation |
| piezoelectricity | A phenomenon observed esp. in certain crystals whereby the application of mechanical… | 1883 | Go To Quotation |
| pinene | Either of two fragrant, liquid, isomeric monoterpenes, C 10 H 16, (more fully α-pinene and β-pinene… | 1885 | Go To Quotation |
| piperazine | A strongly basic crystalline compound, C 4 H 10 N 2, whose molecule is an… | 1889 | Go To Quotation |
| piperidine | A strongly basic liquid with an unpleasant odour whose molecule is a saturated six-membered ring, (CH 2) 5 NH. | 1854 | Go To Quotation |
| plutonyl | The ion PuO 2 2+, often present in solutions of plutonium compounds. Usu. attrib. | 1947 | Go To Quotation |
| polyacetylene | A polyyne; spec. any of a class of compounds containing a polyyne chain which occur… | 1885 | Go To Quotation |
| polymethylene | Originally: any of the series of saturated cyclic hydrocarbons with the formula (CH 2) n;… | 1892 | Go To Quotation |
| polypeptide | An organic polymer consisting of a large number of amino acids linked together in a… | 1903 | Go To Quotation |
| polyphosphate | A salt or ester, or the anion, of a polyphosphoric acid. | 1908 | Go To Quotation |
| polyporic | a bronze-coloured crystalline solid, C 18 H 12 O 4, which is a colouring matter found… | 1877 | Go To Quotation |
| ponasterone | Any of a group of steroids which act as ecdysones in various arthropods and are found… | 1966 | Go To Quotation |
| porphyrinogen | Any of a group of colourless compounds which are reduced derivatives of porphin… | 1913 | Go To Quotation |
| Pr | The element praseodymium. | 1885 | Go To Quotation |
| priorite | A rare mineral of the orthorhombic crystal system consisting of an oxide and hydroxide… | 1907 | Go To Quotation |
| pristane | A saturated hydrocarbon which is a colourless oil and occurs in the liver oils of… | 1923 | Go To Quotation |
| propargyl | An unsaturated hydrocarbon radical related to propyne; 2-propynyl. Usu. attrib. or a formative element in chemical names. | 1872 | Go To Quotation |
| propylenimine | A colourless, liquid, cyclic imine which is widely used industrially, frequently… | 1917 | Go To Quotation |
| propylic | Containing or derived from a propyl radical. | 1850 | Go To Quotation |
| protomeric | Of the nature of a protomer (protomer n.); relating to protomers. | 1923 | Go To Quotation |
| protone | Any of various peptone-like substances produced as the initial products of the hydrolysis of protamines. | 1898 | Go To Quotation |
| protopine | A white crystalline alkaloid present in many plants, esp. of the families Papaveraceae and Fumariaceae. | 1871 | Go To Quotation |
| prototropy | Tautomerism in which the forms differ only in the position of a proton; migration of a… | 1923 | Go To Quotation |
| pseudo-acid | A compound which is not itself an acid but which exists in equilibrium with, or is… | 1899 | Go To Quotation |
| pseudo-base | A compound which is not itself a base but which exists in equilibrium with, or is… | 1899 | Go To Quotation |
| pseudoephedrine | A sympathomimetic drug obtained from plants of the genus Ephedra (or prepared synthetically) and used as a nasal decongestant. | 1889 | Go To Quotation |
| pulegone | A liquid terpenoid ketone with an odour of peppermint, present in pennyroyal (Mentha pulegium) and some related plants. | 1891 | Go To Quotation |
| punicin | A purple colouring matter extracted from glands of molluscs of the genus Purpura… | 1879 | Go To Quotation |
| purpurogallin | An orange-red crystalline dye, originally prepared by mild oxidation of pyrogallol and later found to occur in some oak galls. | 1872 | Go To Quotation |
| pyocyanase | An antibiotic preparation, originally thought to be an enzyme, obtained from cultures… | 1900 | Go To Quotation |
| pyran | Each of two unsaturated, heterocyclic compounds having the formula C 5 H 6 O, whose… | 1904 | Go To Quotation |
| pyranose | A compound whose molecule contains a saturated pyran ring, esp. a sugar having this structure. Freq. attrib. | 1927 | Go To Quotation |
| pyrazole | A weakly basic, crystalline, heterocyclic compound whose molecule is an… | 1887 | Go To Quotation |
| pyrazoline | Each of three heterocyclic compounds having the formula C 3 H 6 N 2 which are… | 1887 | Go To Quotation |
| pyrazolone | Any of a group of compounds which are keto derivatives of pyrazolines; a substituted… | 1887 | Go To Quotation |
| pyridyl | Each of three isomeric radicals derived from pyridine by the removal of a hydrogen… | 1887 | Go To Quotation |
| pyrimidine | A basic, crystalline, heteroaromatic compound which is a diazine with the nitrogen atoms… | 1885 | Go To Quotation |
| pyrocoll | A yellow, crystalline, heterocyclic compound formed when gelatin is distilled. | 1881 | Go To Quotation |
| pyrone | Each of two unsaturated, heterocyclic ketones having the formula C 5 H 4 O 2, spec.… | 1891 | Go To Quotation |
| pyrrolidone | Each of two isomeric compounds which are keto derivatives of pyrrolidine; any substituted derivative of either compound. | 1889 | Go To Quotation |
| quadrivalency | = tetravalence n. at tetravalent adj. Derivatives. | 1905 | Go To Quotation |
| quinaldine | An oily liquid which is present in coal tar, used in the preparation of a… | 1883 | Go To Quotation |
| quinamicine | A substance produced by reaction of quinamine with an acid, originally thought to be an… | 1881 | Go To Quotation |
| quinazoline | A yellow, basic, crystalline solid, which has a bicyclic structure formed from fused… | 1887 | Go To Quotation |
| quinolizine | A hypothetical heterocyclic compound of formula C 9 H 9 N, whose molecule contains… | 1913 | Go To Quotation |
| quinolone | Any of various compounds which are oxidized derivatives of quinoline containing an… | 1892 | Go To Quotation |
| quinoxaline | A weakly basic, crystalline, heterocyclic compound first prepared by reaction of… | 1884 | Go To Quotation |
| reductase | An enzyme which promotes the chemical reduction of a particular substance or class of substances. Freq. with distinguishing word. | 1902 | Go To Quotation |
| refractometric | Carried out or obtained by means of refractometry; of or relating to a refractometer. | 1893 | Go To Quotation |
| Reinecke | a complex salt containing chromium, which forms red crystals and is used… | 1892 | Go To Quotation |
| renatured | Of a substance: that has undergone renaturation. | 1901 | Go To Quotation |
| rhamnose | A sugar of the pentose class which occurs widely in plants, esp. combined as glycosides in berries of buckthorns (genus Rhamnus). | 1888 | Go To Quotation |
| rhodiene | A terpenoid hydrocarbon obtained from the volatile oil of rosewood. | 1872 | Go To Quotation |
| rhodusite | An amphibole mineral occurring as elongated or asbestos-like dark blue fibres, and now identified with magnesioriebeckite. | 1894 | Go To Quotation |
| rinneite | An iron-containing mineral which occurs in saline deposits as colourless, pale rose, violet, or yellow granular masses. | 1909 | Go To Quotation |
| rosasite | A mineral typically found as a bluish or greenish secondary deposit on copper, zinc, and lead ores. | 1909 | Go To Quotation |
| sabadine | A veratrum alkaloid ester, C 29 H 47 NO 8, present in sabadilla seeds. | 1891 | Go To Quotation |
| saccharinic | = saccharic adj. | 1881 | Go To Quotation |
| salmine | A protein, one of the protamines, isolated from the sperm of the salmon and related species. | 1896 | Go To Quotation |
| samarium | A hard grey metallic element of the lanthanide series, found in small quantities in… | 1879 | Go To Quotation |
| sambucene | (See quot. 1875.) | 1872 | Go To Quotation |
| sambunigrin | A colourless crystalline glycoside of the nitrile of d -mandelic acid, found in the leaves… | 1905 | Go To Quotation |
| saponarin | A white or pale yellow crystalline flavonoid diglycoside, 2 C 27 H 30 O 15, first found in soapwort, Saponaria officinalis. | 1902 | Go To Quotation |
| Schotten–Baumann | Used attrib. (esp. as Schotten–Baumann method, Schotten–Baumann reaction) and occas.… | 1895 | Go To Quotation |
| scopol- | a crystalline alkaloid said to have the formula C 17 H 21 NO 4. | 1885 | Go To Quotation |
| scopolamine | A syrupy liquid alkaloid, C 17 H 21 NO 4, having powerful narcotic and sedative… | 1892 | Go To Quotation |
| seco- | A formative element used in naming derivatives, esp. of steroids, in which fission of a… | 1951 | Go To Quotation |
| semicarbazone | Any of a class of (usu. crystalline) compounds of general formula RR′C:N·NH·CO·NH 2… | 1896 | Go To Quotation |
| semidine | Any compound which is either (a) an ortho- anilino-derivative, or (b) an N-para-… | 1893 | Go To Quotation |
| semseyite | A monoclinic sulphide of lead and antimony, Pb 9 Sb 8 S 21, found usu. as grey or black… | 1886 | Go To Quotation |
| serine | A colourless, crystalline amino-acid, CH 2 OH·CHNH 2 ·COOH, which is widely distributed in animal proteins. | 1880 | Go To Quotation |
| shikimic | a hydro-aromatic acid, C 6 H 6 (OH) 3 (COOH), which is formed in many bacteria and… | 1886 | Go To Quotation |
| silane | Any of the large class of hydrides of silicon analogous to the alkanes; spec.… | 1916 | Go To Quotation |
| sitosterol | Any of a number of closely similar crystalline sterols, most of them isomers of formula C 29… | 1898 | Go To Quotation |
| sombrerite | A compound of phosphate of lime and phosphate of alumina, found on the island of… | 1862 | Go To Quotation |
| sorbose | A ketohexose sugar obtained esp. from rowan berries as a fermentation product of sorbitol. | 1889 | Go To Quotation |
| spectrochemical | Of or pertaining to spectrochemistry; spectrochemical series, a series of ligands… | 1896 | Go To Quotation |
| spirane | Any organic compound having two rings in the molecule with a single atom (usu. of… | 1911 | Go To Quotation |
| stachyose | A tetrasaccharide first isolated from the Chinese artichoke, Stachys affinis, and found… | 1890 | Go To Quotation |
| stellerite | A zeolite, CaAl 2 Si 7 O 18.7H 2 O, found as tabular orthorhombic crystals. | 1909 | Go To Quotation |
| sterane | Any of a class of saturated hydrocarbons with a steroid structure which are found in… | 1951 | Go To Quotation |
| stovaine | A local anæsthetic, discovered by Fourneau in 1903 (Comptes Rendus Feb. and May 1904). | 1904 | Go To Quotation |
| sturine | A protamine extracted from the testicles of fish of the genus Accipenser, esp. A. sturio… | 1896 | Go To Quotation |
| suberane | The liquid hydrocarbon cycloheptane. | 1894 | Go To Quotation |
| suberinate | A salt or ester of suberinic acid. | 1891 | Go To Quotation |
| suberonyl | A cycloheptyl radical or group. | 1890 | Go To Quotation |
| suberonylene | The cyclic alkene cycloheptene. | 1890 | Go To Quotation |
| sulphinate | A salt of sulphinic acid. | 1877 | Go To Quotation |
| sulphinic | Applied to acids containing the group SO.OH united to carbon, obtained by reducing the chlorides of the sulphonic acids. | 1877 | Go To Quotation |
| sulphonamide | Any organic compound that is an amide of a sulphonic acid, characterized by the group SO… | 1881 | Go To Quotation |
| sulphonic | Containing the radical SO 2. OH (called the sulphonic group or sulphonic radical). | 1873 | Go To Quotation |
| sulphonium | A hypothetical monovalent complex cation having a central sulphur atom bonded to… | 1894 | Go To Quotation |
| sulvanite | A bronze-coloured sulphide of copper and vanadium, Cu 3 VS 4, that usu. occurs massive… | 1900 | Go To Quotation |
| synchisite | A fluocarbonate of cerium and calcium, occurring in minute yellow crystals. | 1901 | Go To Quotation |
| tallingite | Hydrous chloride of copper, akin to atacamite. | 1865 | Go To Quotation |
| taramellite | An orthorhombic borosilicate of barium and other metals, chiefly iron and titanium, and usu. containing some chlorine. | 1908 | Go To Quotation |
| tautomerism | The property exhibited by certain organic compounds of behaving in different reactions as… | 1890 | Go To Quotation |
| tetrazole | A colourless compound of carbon, nitrogen, and hydrogen, N 4 CH 2 =N CH.NH N = N… | 1892 | Go To Quotation |
| tetrazolium | Any of various derivatives of this, esp. triphenyl tetrazolium chloride, a reagent used as… | 1895 | Go To Quotation |
| tetrodotoxin | A poisonous substance found in the ovaries of certain fish of the family Tetraodontidæ. | 1911 | Go To Quotation |
| thalictrine | A crystalline alkaloid contained in Thalictrum macrocarpum, in poisonous action resembling aconitin but less violent. | 1881 | Go To Quotation |
| thiol | = mercaptan n. | 1900 | Go To Quotation |
| thiomalic | a thio derivative, HOOC·CH 2 ·CH(S)·COOH, of malic acid used in biochemical research and in the chemical industry. | 1905 | Go To Quotation |
| thion- | A name for sulphur taking the place of oxygen in a compound and joined by two bonds to carbon. | 1899 | Go To Quotation |
| thoron | A radioactive isotope of radon, atomic weight 220, that is a gaseous decay product… | 1918 | Go To Quotation |
| thortveitite | A silicate of scandium, (Sc, Y) 2 Si 2 O 7, found as colourless or greyish monoclinic crystals. | 1912 | Go To Quotation |
| thymine | Chem. A colourless crystalline alloxur base, C 5 H 6 N 2 O 2, obtained by the action… | 1894 | Go To Quotation |
| thymo-nucleic | Of or pertaining to the nuclein of the thymus gland; in thymo-nucleic acid, either of two… | 1904 | Go To Quotation |
| tilasite | A fluor-arsenate of calcium and magnesium, CaMg(AsO 4)F, that is isostructural with… | 1897 | Go To Quotation |
| tolidine | A benzidine derivative, (NH 2 (CH 3)C 6 H 3 —) 2, which is the parent compound of a group… | 1879 | Go To Quotation |
| trehalase | An enzyme which catalyses the hydrolysis of trehalose to two molecules of glucose. | 1893 | Go To Quotation |
| triazine | A general term, invented by Widman (1888), for compounds the molecules of which contain… | 1894 | Go To Quotation |
| tricyclic | Of a carbon compound: Having three rings or closed chains of atoms in its structural… | 1891 | Go To Quotation |
| triderivative | A derivative containing three substituted atoms of radicals of the same kind; a tri-substitution product. | 1875 | Go To Quotation |
| trifluor- | A formative analogous to trichlor- comb._form, expressing the substitution of 3 atoms… | 1899 | Go To Quotation |
| trihydro- | A formative denoting that the compound contains the elements of three molecules of water, H… | 1879 | Go To Quotation |
| tripeptide | A compound containing the residues of three amino-acids united by the joining of NH in… | 1903 | Go To Quotation |
| triphen- | A formative of names of compounds containing three radical groups formed from the benzene… | 1890 | Go To Quotation |
| trippkeite | An oxide of copper and arsenic, CuAs 2 O 4, found as soft greenish blue tetragonal crystals. | 1881 | Go To Quotation |
| trisulph- | A formative of the names of carbon compounds containing three SO 2 groups, or three SO… | 1867 | Go To Quotation |
| trisulphone | A compound in which carbon radicals are linked to other carbon radicals by the… | 1892 | Go To Quotation |
| turanose | The reducing disaccharide sugar C 12 H 22 O 11, formed by partial hydrolysis of melezitose; 3-α- d -glucopyranosyl- d -fructose. | 1890 | Go To Quotation |
| undeca- | a yellow, water-insoluble carboxylic acid, CH 2: CH(CH 2) 8 COOH, which is used as an antifungal agent. | 1879 | Go To Quotation |
| unimolecular | In chemical kinetics: having or pertaining to a molecularity of one; involving the… | 1901 | Go To Quotation |
| urochloralic | a metabolite formed in the body after chloral has been administered (see quot. 1977). | 1875 | Go To Quotation |
| vanillyl | The radical, OCH 3 C 6 H 3 (OH)CH<, derived from vanillin; vanillylmandelic acid… | 1876 | Go To Quotation |
| villiaumite | Native sodium fluoride, NaF, occurring as red, pink, or orange transparent isometric crystals. | 1908 | Go To Quotation |
| vinylidene | The bivalent radical CH 2 = C<; freq. attrib. Cf. polyvinylidene n. | 1898 | Go To Quotation |
| xylol | = xylene n. Also attrib. | 1851 | Go To Quotation |
| -yne | orig. variant of -ine suffix, now used in its own right to denote a triple bond between carbon atoms, as in butyne n., propyne n. | 1931 | Go To Quotation |
| yohimbenine | Names of two colourless alkaloids obtained from the bark and leaves of the yohimbé, a West African rubiaceous tree. | 1898 | Go To Quotation |
| zymase | Name given to a ferment obtained from the yeast-fungus; also extended to unorganized ferments or enzymes in general. | 1875 | Go To Quotation |
