| absinthol | An oily liquid that is a constituent of several essential oils, notably oil of wormwood; = thujone… | 1872 | Go To Quotation |
| acetoacetic | = acetoacetic ester n. | 1880 | 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 |
| 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 |
| aldo- | an oxime having the structure RCH=NOH, where R is an alkyl group, formed by reaction of… | 1883 | Go To Quotation |
| aldonic | any of a class of carboxylic acids obtained from aldose sugars by oxidation of the aldehyde group. | 1904 | Go To Quotation |
| alkamine | An organic compound containing both an alcohol (—OH) and an amino (—NH 2) functional… | 1881 | Go To Quotation |
| alkyl | Any of the series of hydrocarbon groups or radicals derived from alkanes by the removal… | 1879 | Go To Quotation |
| alkylating | Of a substance, group, etc.: that alkylates other compounds or groups. | 1900 | 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 |
| allo- | Chem. Prefixed to the name of an organic substance to denote another substance isomeric… | 1886 | Go To Quotation |
| allophite | A mineral of uncertain identity, consisting of hydrated magnesium aluminosilicate and resembling serpentine. | 1874 | Go To Quotation |
| aminonaphthol | Any of a number of isomeric crystalline compounds that are amino derivatives of α-… | 1902 | 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 |
| 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 |
| asymmetric | Chem. Exhibiting, pertaining to, or affected by asymmetry (sense 2b); = stereo-isomeric adj.… | 1875 | Go To Quotation |
| auramine | A synthetic yellow dyestuff of the diphenylmethane series. | 1884 | 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 |
| 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 |
| bastose | = lignocellulose adj. at ligno- comb._form Affix. Also attrib. | 1882 | Go To Quotation |
| biotoxin | A poisonous substance produced by a living organism. | 1910 | 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 |
| brunsvigite | A type of oxidized chlorite occurring in gabbro in the Radauthal, Germany; spec. one… | 1902 | Go To Quotation |
| butanone | Methyl ethyl ketone, CH 3 ·CH 2 ·CO·CH 3, an ethereal liquid used industrially. | 1905 | 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 |
| carballylic | = tricarballylic acid n. at tricarballylic adj. | 1865 | Go To Quotation |
| carbazole | A rather unreactive, crystalline, heterocyclic compound occurring in coal tar and as… | 1872 | Go To Quotation |
| carboxyhaemoglobin | A cherry-red complex of carbon monoxide and haemoglobin formed in the blood when carbon monoxide is inhaled. | 1891 | Go To Quotation |
| carboxylase | Any of various enzymes that bring about a decarboxylation reaction, liberating… | 1911 | Go To Quotation |
| cationic | Of, relating to, or consisting of cations. | 1928 | Go To Quotation |
| cellobiase | An enzyme that catalyses the hydrolysis of cellobiose into glucose. | 1919 | Go To Quotation |
| cellobiose | A disaccharide consisting of two glucose units, obtained by the partial hydrolysis of cellulose. Formerly also called cellose. | 1902 | Go To Quotation |
| cellose | = cellobiose n. (now the usual name). | 1901 | Go To Quotation |
| celtium | An element now generally known as hafnium n. | 1911 | Go To Quotation |
| cenosite | A hydrous silicate and carbonate of yttrium, erbium, and calcium, occurring in Norway… | 1888 | Go To Quotation |
| chalcogen | Any of the elements in group 16 (group VI a) of the periodic table, comprising… | 1940 | 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 |
| chitosan | A substance obtained from chitin, formed by the action of alkali at a high temperature. | 1895 | Go To Quotation |
| chlorocresol | Any of various chlorine derivatives of cresols; esp. the derivative C 7 H 7 ClO… | 1886 | Go To Quotation |
| cholesterol | A steroid alcohol, C 27 H 45 OH, that occurs esp. in animal cells and body fluids. Formerly called cholesterin n. | 1894 | Go To Quotation |
| chondroitic | (see quot. 1944). | 1885 | Go To Quotation |
| chromotropic | Having the property of varying its colour. | 1899 | Go To Quotation |
| chromyl | The divalent radical =CrO 2. Usu. attrib. | 1868 | Go To Quotation |
| cinch- | Variant of cincho- comb._form used before vowels, as in cinchaine, cinchamidine, cinchene, cincholine (see quots.). | 1881 | Go To Quotation |
| cinchol | An alcohol, resembling cholesterol, found in all true cinchona barks. | 1885 | 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 |
| cineole | A volatile compound, C 10 H 18 O, occurring in oil of cajeput, various eucalyptus oils, and other oils. | 1885 | Go To Quotation |
| cinnoline | A poisonous crystalline base, C 8 H 6 N 2. | 1883 | Go To Quotation |
| citral | In the cis- form, neral. | 1891 | 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 |
| clathrate | Chem. Designating or relating to a molecular compound in which one component is… | 1948 | Go To Quotation |
| cobaltammine | Any ammine of cobalt. | 1881 | 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 |
| cory- | abbreviation of Corydalis (see corydaline n.) in names of alkaloids obtainable from… | 1893 | 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 |
| cryohydric | Of or relating to distinctive mixtures of crystalline substances with water (ice)… | 1888 | 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 |
| 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 |
| cytosine | A crystalline pyrimidine derivative, 4-amino-2-hydroxypyrimidine, which is one of the… | 1894 | Go To Quotation |
| dahllite | A variety of hydroxyapatite containing carbonate. | 1890 | Go To Quotation |
| deactivate | trans. To render inactive or less reactive; spec. to deprive of chemical action, to render less chemically reactive. | 1938 | 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 |
| depside | Any of a group of organic compounds found principally in lichens (see quot. 1956). | 1910 | Go To Quotation |
| dewindtite | A hydrated basic phosphate of lead and uranium (see also quot. 1956). | 1922 | Go To Quotation |
| dextran | Med. A preparation of degraded, partially hydrolysed dextran in a suitable solvent… | 1879 | 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 |
| diazonium | A formative used in chemical nomenclature to denote the ion —N 2 + attached to a carbon atom… | 1895 | Go To Quotation |
| dibenzanthracene | Any of several hydrocarbon derivatives of anthracene with a molecular structure consisting… | 1918 | Go To Quotation |
| Diels–Alder | Used attrib. with reference to a synthetic method involving the addition of a conjugated diene… | 1932 | Go To Quotation |
| digoxin | A crystalline glycoside, C 41 H 64 O 14, obtained from the leaves of the… | 1930 | Go To Quotation |
| dionine | Ethylmorphine hydrochloride, used in the treatment of glaucoma, iritis, etc., and to alleviate coughing. | 1899 | Go To Quotation |
| diploicin | A crystalline depsidone, C 16 H 10 O 5 Cl, isolated from the lichen Buellia (= Diploicia) canescens. | 1904 | Go To Quotation |
| dissocioscope | (See quot. 1881.) | 1881 | Go To Quotation |
| echitamine | An alkaloid found in the bark of Echites scholaris and other species of Echites. | 1879 | Go To Quotation |
| eka- | Used 1872 in Ann. d. Chemie u. Pharmacie, VIII. Supplementband 196 by D. I. Mendeléeff… | 1889 | 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 |
| electrovalency | = electrovalence n. | 1923 | Go To Quotation |
| Eötvös | Used attrib. or in the possessive to designate certain apparatus invented and principles enunciated by Eötvös. | 1913 | Go To Quotation |
| ephedrine | An alkaloid, C 10 H 15 NO, that occurs in certain species of Ephedra in four optically… | 1889 | 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 |
| erythrol | = erythritol n. | 1879 | Go To Quotation |
| erythrose | A tetrose sugar, CHO·[CH(OH)] 2 ·CH 2 OH, isolated as a liquid and existing in… | 1900 | Go To Quotation |
| ethenoid | Resembling ethylene in structure or properties; ethylenic. | 1907 | Go To Quotation |
| etherate | Any compound whose molecule contains an ether molecule, esp. (C 2 H 5) 2 O. | 1904 | 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 |
| facellite | = kaliophilite n. | 1891 | 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 |
| fenchane | A liquid that is chemically a saturated bicyclic hydrocarbon of the terpene series, C 10 H… | 1907 | Go To Quotation |
| fenchone | An oily liquid with a camphor-like smell which occurs naturally in two enantiomorphic… | 1891 | Go To Quotation |
| flavonol | Any of the derivatives of this compound, many of which are yellow plant pigments. | 1898 | Go To Quotation |
| flemingin | A crystalline compound, C 12 H 12 O 3, obtained from Flemingia (= Moghania) congesta and used esp. as a yellow dye for silk. | 1898 | Go To Quotation |
| fluor-adelite | The mineral tilasite; an adelite in which much of the hydroxyl is replaced by fluorine. | 1897 | Go To Quotation |
| fluorescin | A compound formed by the reduction of fluorescein. | 1871 | Go To Quotation |
| fluorinated | Chem. Combined with fluorine; containing one or more fluorine atoms as substituents. Cf. fluorinate v. 1. | 1892 | 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 |
| fluoroline | An oily yellow liquid base of uncertain identity, obtained by distilling coal tar. | 1892 | Go To Quotation |
| fluorophore | Any group of atoms whose presence in a molecule causes the molecule to be fluorescent. | 1898 | Go To Quotation |
| formose | A mixture of hexose sugars, originally thought to be a single compound, produced… | 1886 | Go To Quotation |
| furanoside | Any glycoside in the furanose form. | 1932 | Go To Quotation |
| furfuraldehyde | = furfural n. | 1879 | Go To Quotation |
| gadolinium | A metallic element of the lanthanide series which is present in monazite, gadolinite… | 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 |
| galangin | A pale yellow, crystalline, flavonoid compound,originally isolated from the root of the galingale Alpinia officinarum. | 1882 | 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 |
| 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 |
| ganophyllite | A brown hydrous silicate of manganese and aluminium. | 1892 | Go To Quotation |
| Ge | The element germanium. | 1886 | Go To Quotation |
| gentianose | A trisaccharide found in the roots of various species of gentian. | 1883 | Go To Quotation |
| geraniol | A colourless oil with a fragrance of roses that is present in many essential oils (as… | 1871 | Go To Quotation |
| germanious | = germanous adj. | 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 |
| 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 |
| gluconate | A salt or ester of gluconic acid; calcium gluconate, an odourless… | 1884 | Go To Quotation |
| gluconic acid | The acid derived from glucose by oxidation of the aldehyde group to a carboxyl group. | 1871 | Go To Quotation |
| glucosidase | Any enzyme that hydrolyses a glucoside, thereby producing glucose; freq. with… | 1909 | Go To Quotation |
| glutamate | A salt or ester of glutamic acid; esp. the monosodium salt, widely used to flavour food. | 1876 | Go To Quotation |
| glutamic | Biochem. glutamic acid: an amino-acid, HOOC·CH 2 CH 2 CH(NH 2)·COOH, widely distributed… | 1871 | 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 |
| glycerose | = glyceraldehyde n. | 1888 | 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 |
| glycyphyllin | A rhamnoside, known only from Smilax glycyphylla, having phloretin as the aglycone. | 1881 | Go To Quotation |
| glycyrrhizic | a glycoside obtained from liquorice root. | 1879 | 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 |
| gulose | An artificial hexose sugar, C 6 H 10 O 6, which is stereoisomeric with glucose. | 1891 | Go To Quotation |
| gümbelite | A magnesium-containing variety of hydromuscovite. | 1871 | Go To Quotation |
| guvacine | A white crystalline alkaloid, C 6 H 9 NO 2, obtained from the areca nut. | 1891 | Go To Quotation |
| haemerythrin | A red respiratory pigment in the blood of certain invertebrates. | 1903 | Go To Quotation |
| hambergite | A basic borate of beryllium, Be 2 (OH)BO 3, occurring in colourless orthorhombic crystals that have strong double refraction. | 1890 | Go To Quotation |
| hautefeuillite | A hydrous phosphate of magnesium and calcium that occurs in colourless crystals; possibly… | 1896 | Go To Quotation |
| heintzite | A borate of potassium and magnesium, at first also called hintzeite n. and now regarded as the same as kaliborite. | 1891 | 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 |
| hintzeite | = heintzite n. | 1891 | Go To Quotation |
| hirudin | An anticoagulant protein produced by the salivary glands of leeches which acts by combining with thrombin in the blood. | 1905 | 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 |
| hohmannite | A hydrous basic ferrous sulphate, FeSO 4 (OH).3H 2 O, occurring in triclinic crystals… | 1888 | Go To Quotation |
| homatropine | A synthetic alkaloid related to atropine, used mainly to dilate the pupil of the eye. | 1880 | Go To Quotation |
| humulene | A colourless liquid sesquiterpene, C 15 H 24, identical with α-caryophyllene and… | 1895 | 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 |
| hydrazino(-) | A combining form of hydrazine n., denoting the univalent radical NH·NH 2 (or a… | 1907 | 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 |
| hydrogenite | Either of two powders formulated to provide a convenient and portable means of… | 1908 | Go To Quotation |
| hydrol | Chem. Any substituted derivative of benzhydrol (diphenylcarbinol), (C 6 H 5) 2 CHOH; esp. Michler's hydrol (see Michler n.). | 1897 | 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 |
| hydroxylic | Of or containing a hydroxyl group. | 1898 | Go To Quotation |
| hypsochromic | Causing or characterized by a lightening of colour, or a shift of the absorption spectrum towards shorter wavelengths. | 1892 | Go To Quotation |
| ilsemannite | A black or dark blue secondary molybdenum mineral, perhaps a hydrated oxide of molybdenum, Mo… | 1871 | 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 |
| imino(-) | | 1896 | 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 |
| 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 |
| inductomeric | Of, pertaining to, or designating the ability of an atom or group to become polarized… | 1933 | 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 |
| iretol | 2,4,6-Trihydroxyanisole, C 7 H 8 O 4, a crystalline compound obtained by alkaline hydrolysis of irigenin. | 1894 | Go To Quotation |
| irisin | A fructan present in the rhizome of the yellow iris, Iris pseudacorus. | 1887 | 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 |
| johnstrupite | A brownish green hydrous silicate and fluoride of several metals. | 1890 | 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 |
| Kekulé | Used attrib. and in the possessive with reference to a system of structural formulæ… | 1871 | 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 |
| kinzigite | A metamorphic schistose rock containing garnet, biotite, and varying amounts of quartz, plagioclase, sillimanite, and cordierite. | 1878 | 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 |
| kojic | 5-hydroxy-2-hydroxymethyl-γ-pyrone, HO·C 5 H 2 O 2 ·CH 2 OH, a crystalline… | 1913 | 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 |
| ktypeite | A form of aragonite, occurring as pisolites under strain, which decrepitates. | 1898 | Go To Quotation |
| kyrine | Any of various basic substances or mixtures obtained by partial hydrolysis of proteins… | 1903 | Go To Quotation |
| lactalbumin | The fraction of milk proteins which is obtained after the removal of casein and which… | 1885 | Go To Quotation |
| lactam | Any of the class of cyclic amides analogous to the lactones, characterized by the group… | 1883 | Go To Quotation |
| lactim | Any of the class of cyclic imines which are isomers of the lactams and characterized by the group N:C(OH) as part of a ring. | 1883 | Go To Quotation |
| lactonic | = galactonic acid n. | 1871 | Go To Quotation |
| lactonization | Conversion into a lactone. | 1909 | 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 |
| 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 |
| leifite | An acidic aluminosilicate and fluoride of sodium occurring as colourless hexagonal prisms. | 1917 | 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 |
| linamarin | A bitter crystalline compound, C 10 H 17 NO 6, which occurs in flax; the glucoside of acetone cyanohydrin. | 1892 | Go To Quotation |
| linolenic acid | A liquid unsaturated carboxylic acid, C 18 H 30 O 2, which is found as a glyceride in… | 1887 | 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 |
| lithiophorite | A basic oxide of aluminium, lithium, and manganese (Al,Li)MnO 2 (OH) 2, found as bluish-black monoclinic crystals. | 1871 | 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 |
| maclurin | A yellow hydroxylated derivative of benzophenone which occurs (together with morin) in the… | 1876 | Go To Quotation |
| magnetochemical | Of or relating to magnetochemistry. | 1911 | Go To Quotation |
| maleyl | = maleoyl n. Usu. attrib. or as a formative element in chemical names. | 1887 | Go To Quotation |
| malonyl | The divalent radical —CO·CH 2 ·CO— derived from malonic acid by removal of the two hydroxyl groups. Usu. attrib. | 1888 | 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 |
| mannitol | A sweet, crystalline, hexahydric alcohol, CH 2 OH(CHOH) 4 CH 2 OH, known in… | 1879 | 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 |
| mannoside | A glycoside in which the sugar is mannose. | 1897 | Go To Quotation |
| martinite | A (supposed) variety of whitlockite containing carbonate. | 1888 | Go To Quotation |
| maucherite | A tetragonal nickel arsenide, Ni 11 As 8, occurring as brittle, opaque… | 1913 | Go To Quotation |
| melanotekite | A silicate of lead and ferric iron crystallizing in the orthorhombic system and occurring… | 1882 | 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 |
| mescaline | An alkaloid derived from mescal buttons, having intoxicating and hallucinogenic… | 1896 | Go To Quotation |
| mesothorium | Either of two radioactive nuclides in the thorium series: mesothorium I (symbol MsThI)… | 1907 | 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 |
| metamylene | The alkene C 20 H 40 (now called eicosene). | 1851 | Go To Quotation |
| methoxide | The anion CH 3 O −; a salt of this anion. Cf. methylate n. | 1885 | Go To Quotation |
| methoxyl | The organic radical CH 3 O—. Now usu. attrib. | 1866 | Go To Quotation |
| methylcellulose | Any of a range of methylated derivatives of cellulose, varying in the number of… | 1921 | 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 |
| methylol | The hydroxymethyl group, CH 2 OH. | 1898 | Go To Quotation |
| microrespirometric | Of, relating to, or using a microrespirometer. | 1905 | 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 |
| monomethyl | attrib. Designating an organic compound in which a methyl radical takes the place of one hydrogen atom. | 1868 | 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 |
| mossite | A mineral originally regarded as a niobium-rich analogue of tapiolite (esp. as… | 1898 | Go To Quotation |
| multirotation | = mutarotation n. | 1890 | Go To Quotation |
| mutarotating | That exhibits mutarotation. | 1930 | Go To Quotation |
| mutarotation | The change of optical activity with time exhibited by solutions of certain compounds… | 1899 | Go To Quotation |
| myristicene | The liquid component of the volatile oil of nutmeg. | 1872 | Go To Quotation |
| myrtene | A terpene contained in myrtle oil. | 1872 | Go To Quotation |
| mytilotoxin | A poisonous alkaloid produced by certain planktonic organisms and sometimes present in mussels. | 1886 | Go To Quotation |
| naphthacene | A hydrocarbon, C 18 H 12, which is an orange-red solid with explosive properties and… | 1898 | Go To Quotation |
| naphthenic | any of the carboxylic acids obtained in the refining of petroleum, esp. one derived… | 1894 | 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 |
| Nd | The element neodymium. | 1885 | Go To Quotation |
| nefedyevite | A white or pinkish aluminosilicate of magnesium and calcium belonging to the montmorillonite group. | 1873 | Go To Quotation |
| neodymium | A silvery-white metallic element of the lanthanide series, atomic no. 60, which was discovered… | 1885 | Go To Quotation |
| nephrotoxin | Originally: an antiserum produced by the injection of kidney tissue from one species… | 1902 | Go To Quotation |
| neptunium | R. Hermann's name for: a supposed metallic element discovered in the mineral tantalite. disused. | 1877 | Go To Quotation |
| Nessler | a sensitive test devised by Nessler for the detection or measurement of ammonia… | 1865 | 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 |
| nigeran | An alpha-glucan which occurs in the hyphal walls of various fungi. | 1953 | 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 |
| 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 |
| norsteroid | A steroid that lacks a methyl side chain (esp. the one containing the carbon atom numbered… | 1950 | 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 |
| octadecanol | Any of a number of saturated alcohols having the formula C 18 H 37 OH, of which many… | 1914 | Go To Quotation |
| octadecyl | Any of the series of hydrocarbon radicals —C 18 H 37 derived from the octadecanes; spec.… | 1883 | 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 |
| offretite | A mineral of the zeolite group which is a hydrated aluminosilicate of potassium and… | 1891 | Go To Quotation |
| olefin | Chem. Any of the series of unsaturated hydrocarbons containing a double bond and having… | 1860 | Go To Quotation |
| opticity | The degree of optical activity of a solution, esp. as a measure of its concentration in the brewing and food industries. | 1895 | Go To Quotation |
| orcinol | A colourless crystalline phenol which is obtained from orchil and other lichens, turns… | 1880 | Go To Quotation |
| organosol | A dispersion of a colloid in an organic liquid; (now usually) spec. a dispersion of… | 1892 | 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 |
| 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 |
| othyl | A. W. Williamson's name for: the radical —COCH 3, usually called acetyl. | 1852 | Go To Quotation |
| oviglobulin | = ovoglobulin n. | 1889 | Go To Quotation |
| ovomucoid | Originally: a water-soluble proteoglycan found in egg white (now usu. more fully ovomucoid α).… | 1894 | Go To Quotation |
| oxaloacetate | A salt or ester, or the anion, of oxaloacetic acid. | 1891 | Go To Quotation |
| oxalosuccinate | A salt or ester, or the anion, of oxalosuccinic acid. | 1908 | Go To Quotation |
| oxazole | Any of a class of compounds whose molecules contain a ring of one oxygen atom, one… | 1888 | Go To Quotation |
| oxazolidine | Any substituted derivative of the hypothetical heterocyclic compound C 3 H 7 NO (which… | 1902 | Go To Quotation |
| oxazolone | Any of a class of compounds resembling oxazoles but with the CH:CH part of the… | 1899 | Go To Quotation |
| oxidase | Originally: any oxidoreductase. Now: an oxidoreductase which reacts with molecular oxygen, esp.… | 1896 | 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 |
| oxo- | Forming names of compounds or classes of compound containing or involving one or more… | 1888 | Go To Quotation |
| oxonic | (a) = glycollic acid at glycollic adj. (obs.); (b) an acid, C 4 H 3 N 3 O 4, whose structure… | 1863 | Go To Quotation |
| oxygenase | Originally: any oxidase producing hydrogen peroxide. Now: any enzyme which brings… | 1903 | Go To Quotation |
| -oyl | Forming names of radicals, spec. acyl radicals, from names of the corresponding… | 1931 | Go To Quotation |
| para | Chem. Now freq. italicized. Designating a configuration of a benzene ring in… | 1876 | Go To Quotation |
| paracasein | The form of casein produced when the protein in milk is coagulated by rennin, and… | 1896 | 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 |
| pararosaniline | A colourless, crystalline alcohol, (H 2 NC 6 H 4) 3 COH, which is used in… | 1879 | 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 |
| pellotine | An alkaloid, C 13 H 19 NO 3, present in the peyote and related cactuses, and formerly used… | 1895 | Go To Quotation |
| pentaerythritol | A colourless, crystalline, synthetic compound, C(CH 2 OH) 4, which is a tetrahydric alcohol… | 1892 | Go To Quotation |
| pentose | A monosaccharide with five carbon atoms in its molecule (such as ribose and xylose). | 1890 | Go To Quotation |
| peptide | Any compound in which two or more amino acids are linked together, typically in a… | 1906 | 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 |
| peroxo- | Prefixed to the names of chemical compounds. | 1910 | Go To Quotation |
| peroxynitrate | A nitrate containing a higher proportion of oxygen than the simple nitrate; spec.… | 1896 | Go To Quotation |
| pH | A number expressing the acidity or alkalinity of a solution (or of a medium containing… | 1909 | Go To Quotation |
| phase rule | A rule, commonly written P + F = C + 2, relating the possible numbers of phases (P), components (C… | 1896 | 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 |
| phenol | A colourless, mildly acidic, toxic, hygroscopic, crystalline compound, C 6 H 5 OH… | 1849 | 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 |
| phenolphthalin | A crystalline solid, (C 6 H 4 OH) 2 CHC 6 H 5 COOH, which gives phenolphthalein when oxidized, and is used as an indicator. | 1877 | Go To Quotation |
| phenosafranine | A synthetic red azo dye, used in photography as a… | 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 |
| philothion | A substance present in yeast and in some animal tissues and postulated to be responsible… | 1888 | Go To Quotation |
| phloroglucide | A compound of phloroglucinol and another organic molecule, esp. an aldehyde such as furfural. | 1875 | Go To Quotation |
| phloroglucinol | A colourless or yellowish, sweet-tasting, crystalline phenolic compound which occurs… | 1879 | Go To Quotation |
| phoronic | phoronic acid, a crystalline acid obtained by oxidizing… | 1878 | 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 |
| photodimerize | trans. To dimerize by the action of light. Also intr.: to undergo photodimerization. | 1955 | Go To Quotation |
| photopolymerize | trans. To polymerize (a compound) photochemically. Also intr. | 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 |
| phthalazine | An aromatic heterocyclic base, C 8 H 6 N 2, whose molecule resembles that of naphthalene… | 1893 | Go To Quotation |
| phthalein | Any of a series of organic dyes produced by replacing the oxygen atom of one of the C=O… | 1875 | Go To Quotation |
| phytane | A colourless liquid isoprenoid hydrocarbon that is the alkane corresponding to phytol… | 1907 | 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 |
| 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 |
| picein | Chem. A glucoside present in various trees, esp. willows… | 1894 | 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 |
| piezoelectric | Of or relating to piezoelectricity; exhibiting or utilizing piezoelectricity. | 1883 | 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 |
| polymerizable | Capable of being polymerized. | 1884 | 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 |
| polyphenol | A compound which contains more than one phenolic hydroxyl group. | 1894 | Go To Quotation |
| polyphosphate | A salt or ester, or the anion, of a polyphosphoric acid. | 1908 | Go To Quotation |
| ponasterone | Any of a group of steroids which act as ecdysones in various arthropods and are found… | 1966 | Go To Quotation |
| Pr | The element praseodymium. | 1885 | Go To Quotation |
| Prins reaction | An addition reaction between an alkene and an aldehyde in the presence of an… | 1944 | Go To Quotation |
| proline | A heterocyclic imino acid which occurs in proteins and is a major constituent of collagen. | 1904 | 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 |
| propylene | = propene n. | 1850 | Go To Quotation |
| propylic | Containing or derived from a propyl radical. | 1850 | Go To Quotation |
| propylidene | The divalent hydrocarbon radical \ / CH·CH 2 CH 3. Usu. attrib. or a formative element in chemical names. | 1876 | Go To Quotation |
| protactinium | A rare, radioactive, metallic chemical element, atomic number 91, which is a member of… | 1918 | Go To Quotation |
| protomer | Each of a number of tautomeric molecules which differ from each other only in the position of a proton; a prototropic tautomer. | 1923 | 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 |
| 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 |
| pseudoracemic | Consisting of mixed or intergrown crystals of different optical isomers. | 1897 | 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 |
| 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 |
| 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 |
| 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 |
| pyronin | Any of a class of synthetic red xanthene dyes employed chiefly as microscopic stains… | 1895 | Go To Quotation |
| pyrrolidine | A weakly basic, pungent, heterocyclic liquid obtained by catalytic reduction of pyrrole; any substituted derivative of this. | 1885 | 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 |
| pyruvin | A white crystalline ester of pyruvic acid obtained by heating glycerol with tartaric acid. | 1872 | Go To Quotation |
| quadrivalency | = tetravalence n. at tetravalent adj. Derivatives. | 1905 | Go To Quotation |
| quebrachamine | An alkaloid obtained from the bark of the white quebracho and from other trees of the genus Aspidosperma. | 1882 | Go To Quotation |
| quebrachine | = yohimbenine n. | 1881 | Go To Quotation |
| quinacridone | Each of four synthetic isomeric compounds (or their substituted derivatives)… | 1906 | 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 |
| quinamidine | An isomer of quinamine prepared by reaction with an acid. | 1881 | Go To Quotation |
| quinamine | A crystalline alkaloid found in cinchona bark. | 1872 | Go To Quotation |
| quinazoline | A yellow, basic, crystalline solid, which has a bicyclic structure formed from fused… | 1887 | Go To Quotation |
| quininic | Of, relating to, or involving quinine; quininic acid n. a pale yellow crystalline acid derived from quinine. | 1879 | Go To Quotation |
| quinizarin | An orange or red crystalline compound with a tricyclic molecule, isomeric with alizarin. | 1873 | 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 |
| racemism | The state of existing in a racemic form. | 1897 | Go To Quotation |
| raffinose | A trisaccharide sugar consisting of galactose, glucose, and fructose units and found… | 1876 | 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 |
| resorcinol | A solid phenol derivative formerly obtained from galbanum or other resins but… | 1880 | Go To Quotation |
| rhenic | the parent acid of rhenates, an unstable compound known only in solution. | 1931 | 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 |
| rubeanic | an orange-red crystalline solid formed by reaction of cyanogen and hydrogen sulphide, and… | 1891 | Go To Quotation |
| sabadine | A veratrum alkaloid ester, C 29 H 47 NO 8, present in sabadilla seeds. | 1891 | Go To Quotation |
| saccharin | The anhydride of saccharic acid. (Discovered and named by Péligot 1880.) | 1880 | 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 |
| 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 |
| semicarbazide | A colourless, crystalline, basic solid, NH 2 ·CO·NH·NH 2, derived from urea by substitution… | 1892 | Go To Quotation |
| semidine | Any compound which is either (a) an ortho- anilino-derivative, or (b) an N-para-… | 1893 | Go To Quotation |
| septentrionaline | A crystalline alkaloid obtained from Aconitum septentrionale. | 1897 | Go To Quotation |
| silane | Any of the large class of hydrides of silicon analogous to the alkanes; spec.… | 1916 | Go To Quotation |
| Skraup | The name of Zdenko Hans Skraup (1850 – 1910), Czech chemist, used attrib. and in the… | 1886 | 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 |
| spectrochemistry | The branch of chemistry dealing with the chemical application of spectroscopy, esp.… | 1893 | Go To Quotation |
| spirane | Any organic compound having two rings in the molecule with a single atom (usu. of… | 1911 | 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 |
| suberinic | (originally) an amorphous fatty acid obtained by hydrolysis of suberin and said to… | 1891 | Go To Quotation |
| suberonyl | A cycloheptyl radical or group. | 1890 | Go To Quotation |
| suberonylene | The cyclic alkene cycloheptene. | 1890 | Go To Quotation |
| suberylene | The cyclic alkene cycloheptene. | 1894 | 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 |
| sulphonate | To convert into a sulphonate, as by the action of sulphuric acid. | 1882 | Go To Quotation |
| sulvanite | A bronze-coloured sulphide of copper and vanadium, Cu 3 VS 4, that usu. occurs massive… | 1900 | Go To Quotation |
| svabite | A fluoride and arsenate of calcium found as colourless or light-coloured prismatic crystals of the hexagonal system. | 1893 | Go To Quotation |
| synchisite | A fluocarbonate of cerium and calcium, occurring in minute yellow crystals. | 1901 | 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 |
| teichoic | any of various polymers of ribitol or glycerol phosphate that are found in the walls of Gram-positive bacteria. | 1958 | 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 |
| thalenite | An yttrium silicate, Y 3 Si 3 O 10 OH, found as translucent monoclinic crystals. | 1899 | 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 |
| thortveitite | A silicate of scandium, (Sc, Y) 2 Si 2 O 7, found as colourless or greyish monoclinic crystals. | 1912 | Go To Quotation |
| threose | A tetrose sugar, CHO·[CH(OH)] 2 ·CH 2 OH, isolated as a hygroscopic solid and existing… | 1901 | 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 |
| 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 |
| tricarballylic | a crystalline tribasic acid found in immature beets and… | 1865 | Go To Quotation |
| triderivative | A derivative containing three substituted atoms of radicals of the same kind; a tri-substitution product. | 1875 | Go To Quotation |
| trinitride | A compound formed from hydrazoic acid or azoimide, HN 3, by replacement of the hydrogen by a metal; as sodium trinitride, NaN 3. | 1911 | Go To Quotation |
| trional | Trade-name of the synthetic narcotic drug diethylsulphonemethylethylmethane, CH 3 (C 2 H… | 1889 | 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 |
| trisulphone | A compound in which carbon radicals are linked to other carbon radicals by the… | 1892 | Go To Quotation |
| tropinone | A crystalline alkaloid, C 8 H 13 NO, formally derived from tropine by oxidation of the hydroxyl group. | 1896 | Go To Quotation |
| tryptophan | An amino-acid essential in the diet of vertebrates; β-3-indolylalanine, (C 8 H 6 N)CH 2 CH(NH 2)COOH. | 1890 | 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 |
| vanthoffite | A sulphate of sodium and magnesium, Na 6 Mg(SO 4) 4, found as colourless, grey, or… | 1902 | Go To Quotation |
| villiaumite | Native sodium fluoride, NaF, occurring as red, pink, or orange transparent isometric crystals. | 1908 | Go To Quotation |
| xylene | A mixture of three isomeric hydrocarbons having the formula C 8 H 10 = C 6 H 4 (CH 3)… | 1851 | Go To Quotation |
| -yl | Now also in more formal use in Organic Chem. | 1952 | Go To Quotation |
| ylang-ylang | An anonaceous tree (Canangium odoratum) of Malaysia, the Philippines, etc.… | 1876 | 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 |