| acene | Any of the series of compounds with a molecule consisting of a line of fused benzene rings. | 1940 | Go To Quotation |
| acetylenic | Made or derived from acetylene; containing the carbon–carbon triple bond characteristic of acetylene and the alkynes. | 1915 | Go To Quotation |
| activase | An enzyme that activates another substance, esp. an inactive enzyme. | 1928 | Go To Quotation |
| adamantane | A crystalline hydrocarbon, occurring naturally in petroleum deposits, whose molecule… | 1933 | Go To Quotation |
| adsorptivity | Adsorptive power or capacity. | 1912 | Go To Quotation |
| aglucone | Originally: = aglycone n. Subsequently: spec. an aglycone which combines with glucose to form a glucoside. | 1908 | Go To Quotation |
| aldolase | An enzyme that catalyses an aldol condensation reaction or its reversal, esp.… | 1936 | Go To Quotation |
| alkalosis | Increased alkalinity (total base content) of the blood (or other body fluid)… | 1912 | Go To Quotation |
| anhyd. | = anhydrous adj. 1. Usu. as a written abbrev. | 1921 | Go To Quotation |
| anthocyanidin | A plant pigment formed by the hydrolysis of an anthocyanin. | 1914 | Go To Quotation |
| anthrone | A colourless crystalline ketone, C 14 H 10 O. | 1913 | Go To Quotation |
| anti-oxidant | An agent which inhibits oxidation. Also attrib. or adj., that inhibits oxidation. | 1934 | Go To Quotation |
| apo-enzyme | (See quot. 1961.) | 1936 | Go To Quotation |
| apozymase | The residue of zymase after separation of cozymase. | 1926 | Go To Quotation |
| arsanilic | Of or derived from arsenic acid and aniline, esp. arsanilic acid, C 6 H 8 O 3 NAs (= NH 2.C… | 1907 | Go To Quotation |
| artemisinin | A sesquiterpene lactone with an internal peroxide linkage isolated from the plant Artemisia annua… | 1979 | Go To Quotation |
| athrocyte | A cell having the property of absorbing and retaining solid particles. | 1938 | Go To Quotation |
| Auger | Used attrib. in Auger effect, Auger electron (see quot. 1962). | 1931 | Go To Quotation |
| autoprotolysis | A reversible reaction in which a proton is transferred from one molecule of a solvent… | 1934 | Go To Quotation |
| autoregulatory | Relating to or involving autoregulation; contributing to autoregulation. | 1911 | Go To Quotation |
| Avertin | The trade-name of an anæsthetic drug. | 1927 | Go To Quotation |
| azide | A salt or ester of hydrazoic acid. | 1907 | Go To Quotation |
| azlactone | A lactone of an unsaturated nitrogenous hydroxy-acid. | 1917 | Go To Quotation |
| azoprotein | ‘In immunology, a protein coupled with a diazonium compound so as to form an azo derivative’ (MacNalty, Brit. Med. Dict., 1961). | 1918 | Go To Quotation |
| bacteriophage | A minute organism or agent which destroys bacteria. Cf. phage n. | 1921 | Go To Quotation |
| bacteriotropin | (See quot. 1910.) | 1909 | Go To Quotation |
| batyl alcohol | A colourless crystalline alcohol, C 21 H 44 O 3, found in many shark and ray liver oils. | 1922 | Go To Quotation |
| Bayer 205 | A synthetic trypanocidal drug, C 51 H 34 N 6 Na 6 O 23 S 6. | 1922 | Go To Quotation |
| benzodiazepine | Any compound whose molecule contains a benzene ring fused to a seven-membered ring… | 1934 | Go To Quotation |
| binant | A half of a circle or circular body; binant electrometer, an electrometer in which the index moves through half a circle. | 1908 | Go To Quotation |
| bioenergetic | Biol. Of or relating to the production and use of energy in living organisms, or the… | 1913 | Go To Quotation |
| bromellite | A mineral of the zincite group, consisting of beryllium oxide and occurring in white hexagonal prisms. | 1926 | Go To Quotation |
| buna | A synthetic rubber first developed in Germany, made by the polymerization of butadiene. | 1936 | Go To Quotation |
| butyrophenone | n -Propyl phenyl ketone, C 6 H 5 ·CO·(CH 2) 2 CH 3, a liquid. Also, any compound whose structure contains this group. | 1908 | Go To Quotation |
| Cannizzaro | Used attrib. or in the possessive of a reaction of aldehydes with caustic alkali (see quot. 1964). | 1912 | Go To Quotation |
| caprolactam | A crystalline amide, C 6 H 11 NO, used esp. in the manufacture of a type of nylon. | 1944 | Go To Quotation |
| carbon fibre | A fibre of carbon; spec. a slender polycrystalline filament, often very strong, made… | 1960 | Go To Quotation |
| carboxy- | = carboxypeptidase n. | 1930 | Go To Quotation |
| carotenoid | Any one of a group of pigments including the carotenes, the xanthophylls, and fucoxanthin… | 1913 | Go To Quotation |
| cassiopeium | An alternative name (now disused) for a rare-earth element now known as lutetium or lutecium. | 1908 | Go To Quotation |
| cathepsin | Any of various proteolytic enzymes, present in most animal tissues, which aid in… | 1929 | Go To Quotation |
| cellotriose | A trisaccharide consisting of three glucose units, obtained by partial hydrolysis of cellulose. | 1927 | Go To Quotation |
| chalcogenide | A binary compound of an element with a chalcogen, esp. a chalcogen other than oxygen. | 1935 | Go To Quotation |
| cheddite | Any of various high explosives composed essentially of a chlorate, a fatty oil, and one… | 1908 | Go To Quotation |
| chemotaxonomic | Of or relating to chemotaxonomy. | 1957 | Go To Quotation |
| chemotaxonomy | Taxonomy, esp. that of plants, based on comparative chemical analysis. | 1961 | Go To Quotation |
| chimyl alcohol | A crystalline alcohol, cetyl-α-glyceryl-ether, C 19 H 40 O 3, obtained from the liver oils of fishes. | 1924 | Go To Quotation |
| cocarboxylase | Thiamine pyrophosphate or diphosphothiamine, the co-enzyme of carboxylase and other… | 1932 | Go To Quotation |
| co-enzyme | A non-protein organic compound with which an enzyme needs to combine to become active… | 1908 | Go To Quotation |
| consistometer | A device for measuring the consistency of a viscous or plastic material. | 1911 | Go To Quotation |
| coproporphyrin | A porphyrin pigment, C 36 H 38 N 4 O 8, excreted by the liver in bile and found in fæces and urine. | 1924 | Go To Quotation |
| Coramine | The proprietary name of a pyridine derivative used as a respiratory and circulatory stimulant; nikethamide. | 1925 | Go To Quotation |
| corticosteroid | = corticoid n. | 1944 | Go To Quotation |
| corticotrop(h)ic | = adrenocorticotropic adj. | 1934 | Go To Quotation |
| cozymase | One of the names of the co-enzyme nicotinamide-adenine dinucleotide (NAD). | 1924 | Go To Quotation |
| cryptochrome | In form kryptochrome. A name proposed for: a plant pigment which has no… | 1944 | Go To Quotation |
| cryptoxanthin | A yellow carotenoid pigment which is a metabolic precursor of vitamin A and is commonly… | 1934 | Go To Quotation |
| cupferron | A brownish-yellow crystalline compound, C 6 H 5 N(NO)ONH 4, used as a quantitative… | 1910 | Go To Quotation |
| cyanidin | An anthocyanidin (usu. isolated as the chloride, C 15 H 11 O 6 Cl) which in… | 1914 | Go To Quotation |
| cyclonite | A colourless crystalline substance, (CH 2 ·N·NO 2) 3, used as a high explosive; also called RDX. | 1923 | Go To Quotation |
| dealkylation | The removal of an alkyl group or groups. | 1921 | Go To Quotation |
| deamination | The removal of an amino group or groups. | 1912 | Go To Quotation |
| Debye | Used attrib. to designate certain phenomena observed and principles enunciated… | 1914 | Go To Quotation |
| Decalin | = decahydronaphthalene n. | 1920 | Go To Quotation |
| dehydrase | = dehydrogenase n. | 1914 | Go To Quotation |
| dehydrogenase | Any enzyme that transfers hydrogen from a substrate to an acceptor or performs an equivalent oxidation. | 1923 | Go To Quotation |
| delphinidin | An anthocyanidin which is usu. isolated as the chloride, C 15 H 11 O 7 Cl, and which… | 1914 | Go To Quotation |
| demethylate | To remove a methyl group from. | 1933 | Go To Quotation |
| depsidone | Any of a group of compounds related to the depsides and found almost exclusively… | 1935 | Go To Quotation |
| Dial | A preparation of diallylbarbituric acid, used as a sedative. | 1922 | Go To Quotation |
| diene | Any organic compound containing two double bonds between carbon atoms. | 1917 | Go To Quotation |
| diol | Any alcohol whose molecule contains two hydroxyl groups; a dihydric alcohol; = glycol n. b. | 1920 | Go To Quotation |
| diosgenin | A crystalline sapogenin, C 27 H 42 O 3, obtained chiefly from Mexican yams of… | 1937 | Go To Quotation |
| dioxin | Any of three unsaturated heterocyclic compounds, two having the formula C 4 H 6 O 2 and the… | 1919 | Go To Quotation |
| dismutation | Disproportionation: usually, disproportionation involving the simultaneous oxidation… | 1926 | Go To Quotation |
| ebulliometer | An instrument for measuring the boiling points of liquids. | 1933 | Go To Quotation |
| electroendosmosis | The migration of water, esp. through a semipermeable membrane, in response to… | 1913 | Go To Quotation |
| electromer | Each of two or more (usu. hypothetical) isomeric forms which differ only in the… | 1911 | Go To Quotation |
| electron microscopic | Made using an electron microscope; relating to or involving the use of an electron microscope. | 1933 | Go To Quotation |
| electronograph | Physics. An apparatus for studying materials by electron diffraction; (also) an electron diffraction pattern. | 1936 | Go To Quotation |
| electrophoresis | The migration of charged colloidal particles, in differing directions and at differing rates… | 1911 | Go To Quotation |
| emulsoid | A liquid which appears to contain another liquid in colloidal suspension (see also quot. 1956). | 1909 | Go To Quotation |
| epoxy | An element used in the names of chemical compounds that are epoxides. | 1916 | Go To Quotation |
| equilenin | A sex hormone, C 18 H 18 O 2, present in the urine of pregnant mares. | 1933 | Go To Quotation |
| equilin | A sex hormone, C 18 H 20 O 2, present in the urine of pregnant mares. | 1932 | Go To Quotation |
| ergocornine | An alkaloid derived from ergot, C 31 H 39 N 5 O 5. | 1944 | Go To Quotation |
| ergocryptine | An alkaloid derived from ergot. | 1944 | Go To Quotation |
| ergonovine | = ergometrine n. | 1938 | Go To Quotation |
| ethinylœstradiol | A synthetic œstrogen, C 20 H 24 O 2. | 1939 | Go To Quotation |
| ethynyl | The radical CH≡C· derived from ethyne. Usu. attrib.: see also ethinylœstradiol n. | 1933 | Go To Quotation |
| exergy | The maximum amount of work that can be obtained from a given process, or from a given system by reversible processes. | 1959 | Go To Quotation |
| ferritin | A water-soluble crystalline protein containing ferric iron that occurs in many animals… | 1937 | Go To Quotation |
| flavoprotein | Any of a group of conjugated proteins having flavin mononucleotide or flavin… | 1934 | Go To Quotation |
| florentium | A disused name for the element promethium n. | 1927 | Go To Quotation |
| fluorinate | trans. Chem. To introduce one or more atoms of fluorine into (a molecule or compound); to cause to combine with fluorine. | 1931 | Go To Quotation |
| fluorinating | That brings about fluorination. Esp. in fluorinating agent. Cf. fluorinate v. 1. | 1911 | Go To Quotation |
| fluorometry | The measurement of fluorescence from a substance; the use of a fluorometer; spec.… | 1913 | Go To Quotation |
| fluorosis | The condition caused in humans, livestock, and other animals by excessive intake… | 1927 | Go To Quotation |
| fructosan | = fructan n. | 1928 | Go To Quotation |
| fumaroyl | A bivalent radical, CO·CH:CH·CO, derived from fumaric acid. | 1952 | Go To Quotation |
| furaldehyde | Either of the two aldehyde isomers of the compound C 4 H 3 O·CHO derived from furan, esp. 2-furaldehyde or furfural n. | 1916 | Go To Quotation |
| furyl | The univalent radical C 4 H 3 O– based on furan. Cf. furfuryl n. | 1916 | Go To Quotation |
| galactosidase | Any of a class of enzymes that break down galactosides, detaching the galactose residue… | 1914 | Go To Quotation |
| galactosyl | A radical or group derived from galactose by loss of a hydroxyl group. Usu. attrib. or… | 1921 | Go To Quotation |
| galacturonic | galacturonic acid, a crystalline acid which is the uronic acid of galactose, and is the subunit from which pectin is composed. | 1917 | Go To Quotation |
| galipoline | An alkaloid, C 19 H 19 NO 3. | 1929 | Go To Quotation |
| genin | Occas. used as the name of specific compounds. | 1915 | Go To Quotation |
| glucuronide | Any glycosidic compound formed by glucuronic acid. | 1934 | Go To Quotation |
| graininess | The quality of being grainy or granular; granularity. Also fig. | 1921 | Go To Quotation |
| graviton | A hypothetical sub-atomic particle thought of as propagating the action of gravitational force. | 1942 | Go To Quotation |
| guanosine | A nucleoside, C 10 H 13 N 5 O 5, which yields guanine and ribose on hydrolysis and is… | 1909 | Go To Quotation |
| gudmundite | A rare greyish-white antimonide-sulphide of iron, FeSbS, related to arsenopyrite. | 1928 | Go To Quotation |
| haemiglobin | = methaemoglobin n. | 1944 | Go To Quotation |
| hapten | A substance, usu. of low molecular weight, which cannot by itself elicit an antibody… | 1921 | Go To Quotation |
| heteroauxin | A growth-promoting hormone, (C 8 H 6 N)CH 2 ·COOH, that occurs in some plants… | 1935 | Go To Quotation |
| hexogen | = cyclonite n. | 1923 | Go To Quotation |
| holmquistite | A rare basic alumino-silicate of lithium, magnesium, and aluminium that is an… | 1914 | Go To Quotation |
| hormonal | Of, involving, or effected by a hormone or hormones; that is or acts as a hormone. | 1926 | Go To Quotation |
| hügelite | A yellow or brown mineral originally described as a hydrated vanadate of lead and zinc… | 1914 | Go To Quotation |
| hydratase | = hydrase n. | 1922 | Go To Quotation |
| hydrazinium | The less common ion H 3 N + NH 3 + (or a substituted ion derived from this in… | 1927 | Go To Quotation |
| hydroborane | The name used by A. Stock for any of the hydrides or boron that are richer in hydrogen… | 1927 | Go To Quotation |
| hydroborate | = borohydride n. | 1950 | Go To Quotation |
| hydrolytically | By means of hydrolysis; as regards hydrolysis. | 1928 | Go To Quotation |
| hydrotropy | The phenomenon whereby a substance that is only slightly soluble in water will readily dissolve in certain aqueous solutions. | 1928 | Go To Quotation |
| hydroxonium | = hydronium n. | 1925 | Go To Quotation |
| hypericin | A red crystalline compound that is an active principle of St John's wort, Hypericum perforatum… | 1912 | Go To Quotation |
| indolylacetic | = indoleacetic acid. | 1926 | Go To Quotation |
| inhibine | Any of a group of naturally-occurring substances, found chiefly in honey and saliva, which inhibit the growth of bacteria. | 1936 | Go To Quotation |
| interpolymer | (See quot. 1966.) | 1936 | Go To Quotation |
| iodinized | Of a material: treated or impregnated with iodine. | 1919 | Go To Quotation |
| ion exchange | An exchange or interchange of ions; spec. the interchange of ions of like charge… | 1923 | Go To Quotation |
| isolatable | = isolable adj. | 1936 | Go To Quotation |
| isoprenoid | Containing or designating the isoprene unit; having a molecular structure composed of such units. | 1945 | Go To Quotation |
| isosbestic | a wave-length at which the absorption of light by a liquid remains constant as the… | 1925 | Go To Quotation |
| isotactic | Having or designating a polymeric structure in which all the repeating units have the same stereochemical configuration. | 1955 | Go To Quotation |
| isotypy | The character or state of being isotypic (sense 2); isotypic relationship. | 1942 | Go To Quotation |
| kallidin | A supposed hypotensive peptide, released from a globulin by the enzyme kallikrein… | 1950 | Go To Quotation |
| kallikrein | An enzyme found in the human pancreas and elsewhere in the body, which releases kallidin… | 1930 | Go To Quotation |
| katoptrite | A silico-antimonate of bivalent manganese (partly replaced by magnesium and bivalent… | 1917 | Go To Quotation |
| Kerr | Used attrib. to designate certain devices, phenomena, and concepts discovered by Kerr… | 1909 | Go To Quotation |
| kleinite | A hydrous chloride and sulphate of mercury and ammonia, occurring as transparent… | 1907 | Go To Quotation |
| kynurenine | A crystalline amino-acid, H 2 N·C 6 H 4 ·COCH 2 CH(NH 2)COOH, that results from the… | 1931 | Go To Quotation |
| lachrymogenic | Giving rise to lachrymation. | 1921 | Go To Quotation |
| lactol | Any cyclic compound that is formed by the oxygen atom in a C(OH) group (esp. one in… | 1925 | Go To Quotation |
| lactonize | trans. and intr. To change into a lactone. | 1912 | Go To Quotation |
| lanthanide | Any of the series of elements with an atomic number between 57 (lanthanum) and… | 1926 | Go To Quotation |
| Laves phase | Any of a group of intermetallic compounds of composition approximately AB 2 in which… | 1940 | Go To Quotation |
| lecithinase | = phospholipase n. | 1910 | Go To Quotation |
| Liesegang | Used attrib. (esp. in Liesegang ring) and in the possessive to designate (the… | 1913 | Go To Quotation |
| lox | An explosive device which uses liquid oxygen as an oxidant (see quot. 1946). | 1923 | Go To Quotation |
| lumichrome | 6,7-Dimethylalloxazine, C 12 H 10 N 4 O 2,, a crystalline compound that is formed… | 1935 | Go To Quotation |
| lumiflavin | 6,7,9-Trimethylisoalloxazine, C 13 H 12 N 4 O 2, a crystalline compound that is… | 1934 | Go To Quotation |
| lupulone | A bitter, crystalline, cyclic ketone, C 26 H 38 O 4, that is an important constituent of hops and has strong antibiotic activity. | 1919 | Go To Quotation |
| lyochrome | = flavin n. 2. | 1933 | Go To Quotation |
| macrolide | Any of a class of antibiotics containing macrocyclic lactone rings. Also macrolide antibiotic. | 1957 | Go To Quotation |
| macropore | A relatively large pore; (Geol. and Soil Science) a pore which is too large to retain water by capillarity. | 1939 | Go To Quotation |
| magnetochemistry | The branch of science concerned with the interrelation of magnetism and chemical phenomena, molecular and atomic structure, etc. | 1914 | Go To Quotation |
| magnetoplumbite | A strongly magnetic greyish black oxide of manganese, lead, and ferric iron occurring… | 1926 | Go To Quotation |
| magnetostrictive | Of, exhibiting, or utilizing magnetostriction. | 1911 | Go To Quotation |
| maleoyl | The cis form of the divalent radical —CO·CH:CH·CO— derived from maleic acid, which is… | 1956 | Go To Quotation |
| maneb | An organosulphur compound, Mn(S 2 C·NH·C 2 H 4 ·NH·CS 2), used as a protective fungicidal powder on vegetables, fruit, etc. | 1954 | Go To Quotation |
| mannosidase | An enzyme which catalyses the hydrolysis of mannosides, esp. alpha-mannosidase… | 1921 | Go To Quotation |
| manool | A bicyclic diterpenoid alcohol, C 20 H 34 O, which occurs in the oil of manoao wood and is used as a base for perfumes. | 1935 | Go To Quotation |
| mesomerism | A term proposed for: a kind of tautomerism (see quot. 1928). rare. | 1928 | Go To Quotation |
| microelement | Chiefly Plant Physiol. An inorganic micronutrient; a trace element. | 1936 | Go To Quotation |
| moler | A kind of diatomaceous earth found in Denmark and used elsewhere as a building material for its lightness and heat resistance. | 1910 | Go To Quotation |
| monochromator | A device used to select radiation of a single wavelength or energy (or, in practice, a… | 1909 | Go To Quotation |
| monomer | A compound whose molecules can be bonded together (with or without those of a… | 1914 | Go To Quotation |
| morphinan | An oily liquid imine, C 16 H 21 N, whose tetracyclic structure is the basis of that… | 1949 | Go To Quotation |
| mutase | An enzyme which catalyses a dismutation reaction. Now called dismutase. | 1914 | Go To Quotation |
| myrtenal | A terpenoid aldehyde, C 10 H 14 O, related to myrtenol. | 1907 | Go To Quotation |
| myrtenol | A terpenoid alcohol, C 10 H 16 O, found in the essential oil of the European myrtle, Myrtus communis, and other plants. | 1907 | Go To Quotation |
| naphthaleneacetic | either of two crystalline isomers, C 10 H 7 CH 2 COOH, obtained by replacing one of… | 1917 | Go To Quotation |
| nematic | Designating (the state of) a mesophase or liquid crystal in which the molecules all have… | 1923 | Go To Quotation |
| neohesperidin | A bitter flavonoid glycoside, C 28 H 34 O 15, found in the peel of some citrus fruit, esp. Seville oranges. | 1936 | Go To Quotation |
| neosalvarsan | = neoarsphenamine n. | 1912 | Go To Quotation |
| neuraminic | a carboxylic acid, C 9 H 17 NO 8, which is an amino sugar of which derivatives occur… | 1942 | Go To Quotation |
| ninhydrin | A brown crystalline bicyclic compound, C 9 H 6 O 4, which forms deeply coloured… | 1913 | Go To Quotation |
| nitramine | An alkaloid which occurs naturally in several shrubs of the genus Nitraria (nitre-bushes); C 10 H 19 NO. | 1973 | Go To Quotation |
| nitronium | The cation which was supposed to be formed by ionization of pure nitric acid and formulated as + or 2+. rare. | 1925 | Go To Quotation |
| nitrosonium | The nitrosyl cation NO +, formed when nitrogen oxides dissolve in very strong acids. Usu. attrib. | 1934 | Go To Quotation |
| nodulization | The formation of nodules; spec. the process of converting finely divided iron ore into a nodular form. | 1915 | Go To Quotation |
| nor | Designating compounds or groups of compounds conventionally named by adding the prefix nor-… | 1940 | Go To Quotation |
| octamer | A polymeric molecule or structural unit consisting of eight monomers, esp. (a section of) a polynucleotide or polypeptide. | 1929 | Go To Quotation |
| octopine | An amino acid of the opine group, C 9 H 18 N 4 O 4, found in the tissues of some… | 1928 | Go To Quotation |
| ol | attrib. Designating an OH (hydroxyl) group bonded to and serving as a bridge between… | 1907 | Go To Quotation |
| oligonucleotide | A polynucleotide whose molecules are made up of a relatively small number of nucleotides. | 1942 | Go To Quotation |
| opacifier | A substance added to make something opaque. | 1911 | Go To Quotation |
| opacifying | The action or property of making something opaque. | 1914 | Go To Quotation |
| opacimeter | An instrument for measuring the opacity of a body or substance, esp. by measuring the amount of light it reflects. | 1919 | Go To Quotation |
| optochin | A bactericidal derivative of quinine now used chiefly as a diagnostic… | 1914 | Go To Quotation |
| orthohydrogen | The form of molecular hydrogen whose spectrum exhibits a hyperfine structure of triplets… | 1929 | Go To Quotation |
| orthokinetic | Physical Chem. Designating coagulation, aggregation, or flocculation of… | 1927 | Go To Quotation |
| ovoflavin | Riboflavin as found in eggs. | 1933 | Go To Quotation |
| oxalosuccinic | a tricarboxylic acid, HOOC·CO·CH(COOH)·CH 2 ·COOH, which is an intermediate in the… | 1925 | Go To Quotation |
| oxine | A crystalline phenol, C 9 H 7 NO, which forms water-insoluble complexes with many metal… | 1927 | Go To Quotation |
| Pa | The element protactinium. | 1921 | Go To Quotation |
| palaeothermometry | The investigation of the temperature of climates and oceans in the geological past. | 1957 | Go To Quotation |
| Pantopon | A narcotic analgesic consisting of a mixture of the hydrochlorides of opium alkaloids. Cf. Omnopon n. | 1909 | Go To Quotation |
| paracaseinate | A compound containing paracasein bonded to ions of a metal (esp. calcium). | 1907 | Go To Quotation |
| paracrystalline | Relating to or denoting a solid structure which has some degree of order but is not… | 1926 | Go To Quotation |
| parahydrogen | The form of molecular hydrogen in which the two nuclei in the molecule have antiparallel… | 1929 | Go To Quotation |
| paraprotein | A protein found in the blood only in certain abnormal conditions; spec. a monoclonal immunoglobulin. | 1949 | Go To Quotation |
| parsonsite | A hydrated triclinic phosphate of lead and uranium, Pb 2 (UO 2)(PO 4) 2 ·2H 2 O… | 1923 | Go To Quotation |
| pelargonidin | An anthocyanidin (usually isolated as the chloride, C 15 H 11 O 5 Cl) of which pelargonin… | 1914 | Go To Quotation |
| pelargonin | An anthocyanin (usually isolated as the red chloride, C 27 H 31 O 15 Cl) that is… | 1914 | Go To Quotation |
| pentamer | A polymeric molecule or structural unit consisting of five monomers. | 1929 | Go To Quotation |
| peonidin | An anthocyanidin found in some plant tissues (usually isolated as the reddish brown chloride… | 1915 | Go To Quotation |
| Percaine | The local anaesthetic cinchocaine hydrochloride. Cf. Nupercaine n. | 1930 | Go To Quotation |
| perikinetic | Designating coagulation, aggregation, or flocculation of colloidal particles occurring as a result of Brownian motion. | 1927 | Go To Quotation |
| Perlon | A proprietary name for: nylon 6, a type of nylon produced by the polymerization of caprolactam. | 1941 | Go To Quotation |
| permutite | Any of a class of artificial zeolites which are widely used as ion exchangers, esp.… | 1907 | Go To Quotation |
| peroxidative | Involving, characterized by, or caused by peroxidation. | 1908 | Go To Quotation |
| perrhenate | A salt, or the anion ReO 4 −, of perrhenic acid. | 1929 | Go To Quotation |
| perrhenic | a strong oxidizing acid, HReO 4, known only as a colourless aqueous solution. | 1929 | Go To Quotation |
| perrierite | A monoclinic silicate of lanthanides, titanium, iron, and other elements, (Ca,Ce,Th) 4… | 1951 | Go To Quotation |
| petrochemical | Of or relating to the chemistry of rocks (petrochemistry n.). | 1913 | Go To Quotation |
| phaeophorbide | A greyish-green compound formed by the degradation of chlorophyll or phaeophytin (e.g.… | 1911 | Go To Quotation |
| phalloin | A toxic alkaloid, C 35 H 48 N 8 O 10 S, one of the phallotoxins. | 1959 | Go To Quotation |
| phenoloxidase | = phenolase n. | 1913 | Go To Quotation |
| phorbol | A crystalline tetracyclic alcohol, C 20 H 28 O 6, present (in the form of… | 1935 | Go To Quotation |
| phosphatase | Any of a group of enzymes which bring about the synthesis or hydrolysis of esters… | 1912 | Go To Quotation |
| phosphodiesterase | Any of a group of enzymes which bring about the hydrolysis of a phosphodiester bond. | 1932 | Go To Quotation |
| phosphomonoesterase | Any of a group of enzymes which bring about the hydrolysis of terminal phosphate groups from organic molecules; a phosphatase. | 1932 | Go To Quotation |
| phosphorylated | Converted into a phosphate ester; containing a phosphate group or phosphate groups. | 1926 | Go To Quotation |
| phosphorylation | The introduction of a phosphate group into an organic molecule; an instance of this. | 1925 | Go To Quotation |
| photobiological | Of or relating to photobiology. | 1907 | Go To Quotation |
| photomorphogenetic | = photomorphogenic adj. | 1960 | Go To Quotation |
| photomorphogenetically | = photomorphogenically adj. | 1960 | Go To Quotation |
| photopolymerization | Polymerization brought about by the action of light; an instance of this. | 1920 | Go To Quotation |
| photoresistor | A resistor whose resistance varies according to its degree of illumination. | 1959 | Go To Quotation |
| photostereogram | A stereoscopic photograph; = stereophotograph n. at stereo- comb._form Affix. Cf. photostereograph n. 1. | 1913 | Go To Quotation |
| phylloquinone | Vitamin K 1, a yellow, fat-soluble oil that is present in green leafy vegetables and… | 1939 | Go To Quotation |
| phytohormone | A hormone produced by a plant; = hormone n. 2. | 1933 | Go To Quotation |
| pinacol | An alcohol having two hydroxyl groups bonded to adjacent tertiary carbon atoms; spec.… | 1911 | Go To Quotation |
| pinosylvin | Any of a group of toxic substances occurring in pine trees and conferring resistance to… | 1939 | Go To Quotation |
| planchéite | A hydrated silicate and hydroxide of copper, Cu 8 Si 8 O 22 (OH) 4.H 2 O, found in… | 1908 | Go To Quotation |
| plasmal | Any aldehyde resulting from the hydrolysis of a plasmalogen. | 1925 | Go To Quotation |
| plasmalogen | Any of a class of phospholipids that yield an aldehyde on mild hydrolysis, having… | 1925 | Go To Quotation |
| plasticization | The process of making something (more) plastic or mouldable, esp. by treatment with… | 1927 | Go To Quotation |
| plasticize | trans. To make plastic or mouldable; to produce or promote plasticity in (a substance)… | 1927 | Go To Quotation |
| plasticizing | The action of making something (more) plastic; the action of treating or coating with plastic. | 1927 | Go To Quotation |
| Po | The element polonium. | 1910 | Go To Quotation |
| polyacrylate | An ester or salt of a polyacrylic acid; a polymer of an ester of acrylic acid; (more widely) a polymer of acrylic acid. | 1932 | Go To Quotation |
| polyacrylic | a water-soluble polymer of acrylic acid that is a polyelectrolyte used as an additive to increase viscosity. | 1930 | Go To Quotation |
| polyaddition | An addition reaction between two compounds which yields a polymeric product. | 1948 | Go To Quotation |
| polyanion | A negatively charged polyion. | 1931 | Go To Quotation |
| polyanionic | Of, relating to, or of the nature of a polyanion; containing polyanions. | 1930 | Go To Quotation |
| polyene | Any of a class of organic compounds containing two or more carbon–carbon double bonds, usually… | 1928 | Go To Quotation |
| polyether | Any of a variety of polymers in which the repeating unit contains an ether linkage, C—O—C… | 1922 | Go To Quotation |
| polyisoprene | Any of the polymers of isoprene, which include the major constituent of natural rubber… | 1935 | Go To Quotation |
| polypeptidase | An enzyme which hydrolyses polypeptides. | 1922 | Go To Quotation |
| polypropylene | A polymer of propylene; esp. any of a number of durable thermoplastic propylene… | 1935 | Go To Quotation |
| Pomeranchuk | attrib. Designating or relating to a cooling effect observed in certain systems, esp. a… | 1958 | Go To Quotation |
| porphobilin | Any of a group of red-brown pigments derived from porphobilinogen. | 1939 | Go To Quotation |
| porphobilinogen | A colourless, soluble, solid compound which is a metabolic precursor of porphyrins, is… | 1939 | Go To Quotation |
| porphyrinuria | The presence or excretion of excessive or abnormal porphyrins in the urine; any disorder characterized by this. | 1916 | Go To Quotation |
| potentiostatic | Of, relating to, or employing a potentiostat. Also: performed with the potential… | 1955 | Go To Quotation |
| pregnanediol | A steroid alcohol which is a product of the metabolism of progesterone and is used as a… | 1930 | Go To Quotation |
| pregnanolone | A naturally occurring neuroactive steroid which is a reduced metabolite of progesterone… | 1935 | Go To Quotation |
| pregnenolone | A naturally occurring neuroactive steroid which is a precursor of progesterone and… | 1936 | Go To Quotation |
| prenol | Any of a class of alcohols containing one or more isoprene residues in their molecules; an isoprenoid alcohol. | 1939 | Go To Quotation |
| prenyl | A hydrocarbon radical or group C 5 H 8, present in prenols and in polymers of isoprene; an isoprene residue. Usu. attrib. | 1939 | Go To Quotation |
| prodigiosin | A dark red crystalline pigment, C 20 H 25 N 3 O, with antibiotic properties, which is… | 1914 | Go To Quotation |
| protoanemonin | A pale yellow, poisonous, vesicant oil with bacteriostatic and fungistatic properties… | 1920 | Go To Quotation |
| protohaem | A haem complex containing a protoporphyrin bonded ionically to a ferrous iron (Fe 2+) cation. | 1931 | Go To Quotation |
| protolysis | A protolytic reaction; proton transfer in solution. | 1934 | Go To Quotation |
| protopectin | A water-insoluble pectic substance containing glucuronic acid monomers, which is present… | 1908 | Go To Quotation |
| protoporphyrin | Any of a group of fifteen isomeric porphyrins having the formula C 34 H 34 N 4 O 4, in… | 1925 | Go To Quotation |
| pseudohalide | A compound, ion, or radical formed by a pseudohalogen. | 1925 | Go To Quotation |
| pseudohalogen | Any of a group of compounds (in some cases hypothetical) which have small molecules built… | 1925 | Go To Quotation |
| pterin | A substituted derivative of pteridine; esp. any of a class of these compounds which… | 1934 | Go To Quotation |
| pustulin | = pustulan n. | 1943 | Go To Quotation |
| pyrrolizidine | A colourless basic liquid which has a molecule consisting of two fused pyrrolidine rings… | 1939 | Go To Quotation |
| quadrupole | A multipole (multipole n.) of order 2; esp. a system of four magnetic or electric monopoles with no net pole strength or charge. | 1921 | Go To Quotation |
| quinacrine | An antiprotozoal agent used esp. to treat malaria (originally) and giardiasis and also for histochemical staining. | 1934 | Go To Quotation |
| radiocolloid | A radioactive substance in colloidal form. | 1930 | Go To Quotation |
| ramdohrite | A silver-containing sulphide mineral occurring as long grey-black prisms. | 1931 | Go To Quotation |
| Raschig | a small cylindrical ring usually made of glass, metal, or ceramic material, and used… | 1920 | Go To Quotation |
| Re | The element rhenium. | 1925 | Go To Quotation |
| resinophore | A group of atoms whose presence in a molecule makes it susceptible to polymerization to… | 1922 | Go To Quotation |
| rhenate | A salt containing oxyanions of rhenium; spec. a salt of the anion ReO 4 2−. Cf. perrhenate n. | 1929 | Go To Quotation |
| rhodanese | A naturally occurring enzyme which catalyses the formation of thiocyanate and… | 1933 | Go To Quotation |
| ribityl | The group or radical —CH 2 ·(CHOH) 3 ·CH 2 OH, derived from ribitol by the loss of… | 1935 | Go To Quotation |
| rotaxane | Any compound having a molecular structure in which a chain of atoms is threaded through… | 1969 | Go To Quotation |
| rubrene | A red, crystalline, polyaromatic hydrocarbon with semiconductor properties, used as a source of light in LEDs and light sticks. | 1926 | Go To Quotation |
| saccharase | Invertase, sucrase. | 1920 | Go To Quotation |
| sainfeldite | A hydrous arsenate of calcium, Ca 5 H 2 (AsO 4) 4.4H 2 O, occurring as small rosettes of transparent monoclinic crystals. | 1964 | Go To Quotation |
| sakhaite | A hydrous borate and carbonate of calcium and magnesium, the crystals of which belong to… | 1966 | Go To Quotation |
| saléeite | A hydrated phosphate of magnesium and uranium, Mg(UO 2) 2 (PO 4) 2 ·10H 2 O, which… | 1934 | Go To Quotation |
| scholzite | A hydrated basic phosphate of calcium and zinc, Ca 3 Zn(PO 4) 2 (OH) 2.H 2 O, occurring… | 1950 | Go To Quotation |
| sclareol | A colourless crystalline diterpenoid alcohol, C 20 H 36 O 2, found in the leaves of… | 1928 | Go To Quotation |
| scopine | A colourless crystalline alkaloid, C 8 H 13 NO 2, formed by hydrolysis of scopolamine… | 1923 | Go To Quotation |
| selachyl | an oily liquid, α-glyceryl cis -9-octadecenyl ether, C 21 H 42 O 3, found in the liver oils of elasmobranch fishes. | 1922 | Go To Quotation |
| self-diffusion | Migration of constituent atoms or molecules within the bulk of a substance, esp. in a crystalline solid. | 1924 | Go To Quotation |
| self-heating | The action of becoming heated spontaneously or automatically. Also as ppl. adj., that… | 1929 | Go To Quotation |
| septanose | A structure containing a seven-membered ring, adopted by some sugars; a sugar having this structure. Freq. attrib. | 1934 | Go To Quotation |
| sequestrant | A sequestering agent. Also attrib. or as adj. | 1951 | Go To Quotation |
| shock wave | A disturbance that travels through a fluid as a narrow region in which there is a… | 1907 | Go To Quotation |
| silumin | Any of a series of casting alloys of aluminium containing about 9 to 13 per cent silicon. | 1922 | Go To Quotation |
| sklodowskite | A hydrated uranyl magnesium silicate, Mg(UO 2) 2 Si 2 O 7.6H 2 O, which occurs as… | 1924 | Go To Quotation |
| smolyaninovite | A hydrated arsenate of iron, cobalt, nickel, and other metals found as a yellow oxidation product of cobalt and nickel ores. | 1957 | Go To Quotation |
| solubilizer | A solubilizing agent. | 1963 | Go To Quotation |
| solvolyse | intr. To undergo solvolysis. | 1916 | Go To Quotation |
| solvolysis | The decomposition or dissociation of a solute brought about by the action of the solvent. | 1916 | Go To Quotation |
| spermacide | = spermicide n. | 1908 | Go To Quotation |
| sporonin | An inert substance forming the resistant outer covering of spores. Cf. sporopollenin n. | 1928 | Go To Quotation |
| sporopollenin | An inert substance, consisting largely of polysaccharides, that forms the resistant outer coating of spores and pollen grains. | 1931 | Go To Quotation |
| stereoblock | A segment of a polymer chain possessing stereoregularity. Also attrib., as stereoblock polymer… | 1957 | Go To Quotation |
| stevioside | A glycoside, C 38 H 60 O 18, present in the leaves of a Paraguayan herb (Stevia rebaudiana)… | 1931 | Go To Quotation |
| stigmasterol | A phytosterol, C 29 H 48 O, present in Calabar beans (Physostigma venenosum) and soya beans. | 1907 | Go To Quotation |
| succinylcholine | The ion [—CH 2 COO·(CH 2) 2 + N (CH 3) 3] 2 formed by esterification of succinic acid… | 1950 | Go To Quotation |
| sulphane | Any of the hydrides of sulphur, H 2 S x. | 1955 | Go To Quotation |
| sulphatase | Any of a group of enzymes found chiefly in mammalian tissues which catalyse the hydrolysis of sulphuric acid esters. | 1924 | Go To Quotation |
| sulphonyl | The divalent radical SO 2 , derived from a sulphonic acid group by removal of the OH group. Usu. attrib. | 1920 | Go To Quotation |
| sursassite | A hydrated silicate of manganese and aluminium, found as tufts and radial aggregates… | 1928 | Go To Quotation |
| suspensoid | A lyophobic colloid from which the dispersed phase is readily (and… | 1909 | Go To Quotation |
| synthalin | A synthetic but toxic aliphatic diguanidine which has the hypoglycæmic effect of insulin… | 1927 | Go To Quotation |
| synthol | (See quot. 1938.) | 1924 | Go To Quotation |
| tachysterol | An oily isomer of ergosterol and lumisterol, C 28 H 43 OH, which will form calciferol when irradiated with ultraviolet light. | 1933 | Go To Quotation |
| tactoid | A small anistropic, birefringent region in a dilute, isotropic sol, consisting of an… | 1929 | Go To Quotation |
| tall oil | A resinous mixture of fatty acids, resin acids, and plant sterols recovered when… | 1909 | Go To Quotation |
| talmessite | A hydrated arsenate of calcium, magnesium, and barium, Ca 2 (Mg, Ba)(AsO 4) 2.2H 2 O, found as triclinic crystals. | 1961 | Go To Quotation |
| terpenoid | A terpene in the broadest sense: used when terpene itself is restricted to compounds… | 1933 | Go To Quotation |
| tertschite | A hydrated calcium borate found as white, fibrous, probably monoclinic crystals. | 1953 | Go To Quotation |
| testosterone | A steroid hormone that stimulates the development of male secondary sexual… | 1935 | Go To Quotation |
| tetrachloroethylene | = perchloroethylene n. Also called ˌtetrachloroˈethene n. | 1911 | Go To Quotation |
| Tetralin | = tetrahydronaphthalene n. at tetra- comb._form 2a(c)(ii). (A proprietary name in the U.S.) | 1920 | Go To Quotation |
| tetramer | A compound whose molecule is composed of four molecules of monomer. | 1929 | Go To Quotation |
| thermochromism | The phenomenon whereby certain substances undergo a reversible change of colour or shade when heated or cooled. | 1914 | Go To Quotation |
| thermogravimetry | The technique of chemically analysing substances by measuring changes in weight as a function of increasing temperature. | 1951 | Go To Quotation |
| thiazolidine | Any compound containing this ring structure in its molecule. | 1916 | Go To Quotation |
| thixotropy | The property of certain gels of becoming fluid when agitated and of reverting back to a gel when left to stand. | 1927 | Go To Quotation |
| thoreaulite | A monoclinic oxide of tin and tantalum, SnTa 2 O 6, found as rough brown prismatic… | 1934 | Go To Quotation |
| tinzenite | A basic silicate of calcium, manganese, aluminium, boron, and iron that occurs as… | 1924 | Go To Quotation |
| transannular | Situated, existing, or occurring between non-adjacent atoms forming a ring. | 1926 | Go To Quotation |
| triene | Any organic compound containing three double bonds between carbon atoms. | 1917 | Go To Quotation |
| trinitrotoluene | Any of three isomeric nitro derivatives, CH 3 C 6 H 2 (NO 2) 3, of toluene, esp.… | 1908 | Go To Quotation |
| triphosphopyridine nucleotide | = nicotinamide adenine dinucleotide n. at nicotinamide n. Compounds. | 1937 | Go To Quotation |
| tropane | A saturated bicyclic tertiary amine which is a basic liquid obtained from various plants… | 1919 | Go To Quotation |
| trypaflavine | = acriflavine n. | 1913 | Go To Quotation |
| Tylose | A proprietary name for various esters or ethers (esp. the methyl ether) of cellulose, used… | 1934 | Go To Quotation |
| ultrafiltration | The action or process of filtration through a medium sufficiently fine to… | 1908 | Go To Quotation |
| uroporphyrin | Any of a group of porphyrins, occurring esp. in the urine during certain types of… | 1924 | Go To Quotation |
| uroporphyrinogen | Any porphyrinogen in which the pyrrole rings have side chains as in a uroporphyrin. | 1924 | Go To Quotation |
| urushiol | An oily phenolic liquid causing skin irritation which is present in various plants and is… | 1908 | Go To Quotation |
| ussingite | A triclinic basic sodium aluminosilicate, Na 2 AlSi 3 O 8 OH, found as reddish-violet crystals. | 1914 | Go To Quotation |
| valine | An amino-acid that is an essential nutrient for vertebrates and a general constituent… | 1907 | Go To Quotation |
| valinomycin | A dodecapeptide obtained from the fungus Streptomyces fulvissimus, which has… | 1955 | Go To Quotation |
| väyrynenite | A phosphate and fluoride of beryllium and manganese, BeMnPO 4 (OH,F), found as red transparent monoclinic crystals. | 1954 | Go To Quotation |
| Verneuil | The name of A. V. L. Verneuil (1856 – 1913), French chemist, used attrib. with reference… | 1912 | Go To Quotation |
| Vinylon | Any of a class of synthetic fibres made from polyvinyl alcohol treated with formaldehyde… | 1952 | Go To Quotation |
| violaxanthin | A xanthophyll, C 40 H 56 O 4, occurring as a yellow pigment in daffodils and some other plants. | 1931 | Go To Quotation |
| viseite | A hydrous basic calcium and aluminium silicophosphate occurring as translucent… | 1944 | Go To Quotation |
| vysotskite | A sulphide of palladium and often nickel, (Pd,Ni)S, found as minute silvery tetragonal crystals having a metallic lustre. | 1963 | Go To Quotation |
| warfarin | A water-soluble crystalline anticoagulant used as a selective rodenticide, and as… | 1950 | Go To Quotation |
| wölsendorfite | A hydrated oxide of lead, calcium, and uranium, (Pb,Ca)U 2 O 7.2H 2 O, found as orange or red orthorhombic crystals. | 1957 | Go To Quotation |
| wüstite | An isometric solid solution of magnetite (Fe 3 O 4) in iron oxide (FeO). | 1928 | Go To Quotation |
| ylid | Any neutral compound containing a negatively charged carbon atom directly bonded to… | 1951 | Go To Quotation |
| yperite | = mustard gas n. s.v. mustard n. 4. | 1919 | Go To Quotation |
| zeaxanthin | A xanthophyll, C 40 H 56 O 4, originally isolated from Indian corn, Zea mays. | 1929 | Go To Quotation |
| zirconolite | A mixed oxide of (essentially) calcium, zirconium, and titanium, now regarded as identical with zirkelite. | 1957 | Go To Quotation |
