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Orthometric :: Orthometric (a.) Having the axes at right angles to one another; -- said of crystals or crystalline forms.

Cerotin :: Cerotin (n.) A white crystalline substance, C27H55.OH, obtained from Chinese wax, and regarded as an alcohol of the marsh gas series; -- called also cerotic alcohol, ceryl alcohol..

Pyrocatechin :: Pyrocatechin (n.) A white crystalline substance, C6H4(OH)2, of the phenol series, found in various plants; -- so called because first obtained by distillation of gum catechu. Called also catechol, oxyphenol. etc..

Oxamide :: Oxamide (n) A white crystalline neutral substance (C2O2(NH2)2) obtained by treating ethyl oxalate with ammonia. It is the acid amide of oxalic acid. Formerly called also oxalamide.

Microcrystalline :: Microcrystalline (a.) Crystalline on a fine, or microscopic, scale; consisting of fine crystals; as, the ground mass of certain porphyrics is microcrystalline..

Bay Salt :: Bay salt () Salt which has been obtained from sea water, by evaporation in shallow pits or basins, by the heat of the sun; the large crystalline salt of commerce..

Orsellinic :: Orsellinic (a.) Pertaining to, or designating, an organic acid obtained by a partial decomposition of orsellic acid as a white crystalline substance, and related to protocatechuic acid..

Helenin :: Helenin (n.) A neutral organic substance found in the root of the elecampane (Inula helenium), and extracted as a white crystalline or oily material, with a slightly bitter taste..

Pyrogallol :: Pyrogallol (n.) A phenol metameric with phloroglucin, obtained by the distillation of gallic acid as a poisonous white crystalline substance having acid properties, and hence called also pyrogallic acid. It is a strong reducer, and is used as a developer in photography and in the production of certain dyes..

Quinidine :: Quinidine (n.) An alkaloid isomeric with, and resembling, quinine, found in certain species of cinchona, from which it is extracted as a bitter white crystalline substance; conchinine. It is used somewhat as a febrifuge..

Orpiment :: Orpiment (n.) Arsenic sesquisulphide, produced artificially as an amorphous lemonyellow powder, and occurring naturally as a yellow crystalline mineral; -- formerly called auripigment. It is used in king's yellow, in white Indian fire, and in certain technical processes, as indigo printing..

Theobromine :: Theobromine (n.) An alkaloidal ureide, C7H8N4O2, homologous with and resembling caffeine, produced artificially, and also extracted from cacao and chocolate (from Theobroma Cacao) as a bitter white crystalline substance; -- called also dimethyl xanthine..

Thalline :: Thalline (n.) 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..

Chelerythrine :: Chelerythrine (n.) An alkaloidal principle obtained from the celandine, and named from the red color of its salts. It is a colorless crystalline substance, and acts as an acrid narcotic poison. It is identical with sanguinarine..

Durene :: Durene (n.) A colorless, crystalline, aromatic hydrocarbon, C6H2(CH3)4, off artificial production, with an odor like camphor..

Nitraniline :: Nitraniline (n.) Any one of a series of nitro derivatives of aniline. In general they are yellow crystalline substances.

Saccharin :: Saccharin (n.) A bitter white crystalline substance obtained from the saccharinates and regarded as the lactone of saccharinic acid; -- so called because formerly supposed to be isomeric with cane sugar (saccharose).

Phloroglucin :: Phloroglucin (n.) A sweet white crystalline substance, metameric with pyrogallol, and obtained by the decomposition of phloretin, and from certain gums, as catechu, kino, etc. It belongs to the class of phenols. [Called also phloroglucinol.].

Physostigmine :: Physostigmine (n.) An alkaloid found in the Calabar bean (the seed of Physostigma venenosum), and extracted as a white, tasteless, substance, amorphous or crystalline; -- formerly called eserine, with which it was regarded as identical..

Purpurin :: Purpurin (n.) A dyestuff resembling alizarin, found in madder root, and extracted as an orange or red crystalline substance..

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