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acid (called also hydroxy malonic acid) obtained, by reducing mesoxalic acid, as a white crystalline substance.

A red crystalline compound related to, or produced from, erythrin. So called because regarded as the end of the series of erythrin compounds.

A polymeric modification of terpene, obtained as a white crystalline camphorlike substance; -- called also camphene. By extension, any one of a group of related substances.

g an acid, C7H10O4, obtained by the oxidation of terbenthene with nitric acid, as a white crystalline substance.

Of, pertaining to, or designating, a complex acid, C7H8O4, obtained as a white crystalline substance by a modified oxidation of terebic acid.

of the aromatic series, metameric with phthalic acid, and obtained, as a tasteless white crystalline powder, by the oxidation of oil of turpentine; -- called also paraphthalic acid. Cf. Phthalic.

H12O4 (called also terpentic acid), homologous with terebic acid, and obtained as a white crystalline substance by the oxidation of oil of turpentine with chromic acid.

A white crystalline substance regarded as a hydrate of oil of turpentine.

A crystalline acid substance, CH2N4, which may be regarded as pyrrol in which nitrogen atoms replace three CH groups; also, any of various derivatives of the same.

Of, pertaining to, or designating, a complex ketonic acid, C5H6O3, obtained as a white crystalline substance; -- so called because once supposed to contain a peculiar radical of four carbon atoms. Called also acetyl-acrylic acid.

, C3H3.CO2H, of the acetylene series, homologous with propiolic acid, obtained as a white crystalline substance.

An artificial alkaloid of the quinoline series, obtained as a white crystalline substance, C10H13NO, whose salts are valuable as antipyretics; -- so called from the green color produced in its solution by certain oxidizing agents.

tter (from the Theobroma Cacao), peanut oil (from Arachis hypogæa), etc., as a white waxy crystalline substance.

lly, and also extracted from cacao and chocolate (from Theobroma Cacao) as a bitter white crystalline substance; -- called also dimethyl xanthine.

A white crystalline substance derived from urethane, used in medicine as an antipyretic, etc.

A ketone derivative of thiophene obtained as a white crystalline substance, (C4H3S)2.CO, by the action of aluminium chloride and carbonyl chloride on thiophene.

A calcareous tufa, in part crystalline, occurring on a large scale as a shore deposit about the Quaternary lake basins of Nevada.

ting of a complex sulphur derivative of certain aromatic diamines, and obtained as a dark crystalline powder; -- called also phenylene violet.

A beautiful fluorescent crystalline substance, intermediate in composition between thionol and thionine.

mene, C10H13.OH, isomeric with carvacrol, found in oil of thyme, and extracted as a white crystalline substance of a pleasant aromatic odor and strong antiseptic properties; -- called also hydroxy cymene.