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of the acetylene or tetrolic series, analogous to propionic acid, and obtained as a white crystalline substance.C3H2O2, CH.C.COOH

Pertaining to, derived from, or designating, an organic acid which is obtained as a white crystalline substance from catechin, asafetida, oil of cloves, etc., and by distillation itself yields pyrocatechin.

An alkaloid found in opium in small quantities, and extracted as a white crystalline substance.

t gelatinous cones found in the compound eyes of certain insects, taking the place of the crystalline cones of others.

The state of having, or the property of taking, a crystalline form unlike that which belongs to the species.

ng to, or designating, an acid obtained by the decomposition of vulpinic acid, as a white crystalline substance.

A dyestuff resembling alizarin, found in madder root, and extracted as an orange or red crystalline substance.

A greenish yellow crystalline coloring matter found with pyocyanin in pus.

One of the less volatile hydrocarbons of coal tar, obtained as a white crystalline substance, C16H10.

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.

A yellow crystalline substance allied to pyrrol, obtained by the distillation of gelatin.

meric 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.

Pertaining to, derived from, or designating, an acid obtained as a white crystalline substance by the distillation of mucic acid, or by the oxidation of furfurol.

Pertaining to, or designating, an acid, H4P2O7, which is obtained as a white crystalline substance. Its salts are obtained by heating the phosphates.

Pertaining to, or designating, an acid obtained as a white crystalline substance by the distillation of tartaric acid.

A yellow crystalline hydrocardon extracted from crude wood spirit; -- called also eblanin.

rent, but sometimes also yellow, brown, purple, green, and of other colors; also in cryptocrystalline massive forms varying in color and degree of transparency, being sometimes opaque.

The bitter principle of quassia, extracted as a white crystalline substance; -- formerly called quassite. [Written also quassiin, and quassine.]

A white crystalline substance, C6H7(OH)5, found in acorns, the fruit of the oak (Quercus). It has a sweet taste, and is regarded as a pentacid alcohol.

A yellow crystalline substance, occurring quite widely distributed in the vegetable kingdom, as is apple-tree bark, horse- chestnut leaves, etc., but originally obtained by the decomposition of quercitrin. Called also meletin.