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elatinous 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.

eudomorphous crystal, one which has a form that does not result from its own powers of crystallization.

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

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 common mineral of a pale brass-yellow color and brilliant metallic luster, crystallizing in the isometric system; iron pyrites; iron disulphide. Hence sable coal his massy couch extends, And stars of gold the sparkling pyrite blends. E. Darwin.

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.

ic 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.

en and brown hexagonal crystals and also massive; -- so called because a fused globule crystallizes in cooling.

Having the property of crystallizing by the agency of fire.

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.

t, 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.