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A pale green mineral occurring in crystalline aggregates having a botryoidal or mammillary structure, and rarely in distinct crystals. It is a hydrous silicate of alumina and lime.

Pertaining to, or designating, a tetrabasic acid of benzene obtained as a white crystalline substance; -- probably so called from the resemblance of the wartlike crystals to the mammillæ on the surface of prehnite.

A defect of vision consequent upon advancing age. It is due to rigidity of the crystalline lens, which producepresbytia.

mary rocks (Geol.), a term early used for rocks supposed to have been first formed, being crystalline and containing no organic remains, as granite, gneiss, etc.; -- called also primitive rocks. The terms Secondary, Tertiary, and Quaternary rocks have also been used in like manner, but of these the last two only are no…

all the inclosed spheres with their planets in a daily revolution from east to west. See Crystalline heavens, under Crystalline. The motions of the greatest persons in a government ought to be, as the motions of the planets, under primum mobile. Bacon.

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.