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A crystalline or amorphous pigment, free from iron, formed from hematin in old blood stains, and in old hemorrhages in the body. It resembles bilirubin. When present in the corpora lutea it is called hæmolutein.

izes under different forms from different animals, and when crystallized, is called hæmatocrystallin. See Blood crystal, under Blood.

A white, crystalline substance having a sweetish taste, obtained by the decomposition of hesperidin, and regarded as a complex derivative of caffeic acid.

A glucoside found in ripe and unripe fruit (as the orange), and extracted as a white crystalline substance.

Obtained from the urine of horses; as, hippuric acid. Hippuric acid, a white crystalline substance, containing nitrogen, present in the urine of herbivorous animals, and in small quantity in human urine. By the action of acids, it is decomposed into benzoic acid and glycocoll.

A near similarity of crystalline forms between unlike chemical compounds. See Isomorphism.

excellent humor was expended on the perplexities of mine host. W. Irving. Aqueous humor, Crystalline humor or lens, Vitreous humor. (Anat.) See Eye. -- Out of humor, dissatisfied; displeased; in an unpleasant frame of mind.

A derivative of urea, C3H4N2O2, obtained from allantion, as a white, crystalline substance, with a sweetish taste; -- called also glycolyl urea.

One of a group of crystalline bodies produced by the action of ammonia on certain aldehydes.

he rootstock of the golden seal (Hydrastis Canadensis), and extracted as a bitter, white, crystalline substance. It is used as a tonic and febrifuge.

A white, crystalline, nitrogenous hydrocarbon, C9H9NO, obtained from certain derivatives of cinnamic acid and closely related to quinoline and carbostyril.

A white, crystalline benzene derivative, C8H10O2, obtained by the reduction of phlorone.

A white crystalline substance, C6H4(OH)2, obtained by the reduction of quinone. It is a diacid phenol, resembling, and metameric with, pyrocatechin and resorcin. Called also dihydroxy benzene.

with other alkaloids in the thorn apple and deadly nightshade. It is extracted as a white crystalline substance, with a sharp, offensive taste. Hyoscyamine is isomeric with atropine, is very poisonous, and is used as a medicine for neuralgia, like belladonna. Called also hyoscyamia, duboisine, etc.

Partly idiomorphic; -- said of rock a portion only of whose constituents have a distinct crystalline form. -- Hy*pid`i*o*mor"phic*al*ly, adv.

e earthnut, in which it exists as a glyceride, and from which it is extracted as a white, crystalline substance.

orus. It may be obtained from its water solution, by exaporation and freezing, as a white crystalline substance. It is a powerful reducing agent.

A crystalline, nitrogenous substance, closely related to xanthin and uric acid, widely distributed through the animal body, but especially in muscle tissue; -- called also sarcin, sarkin.

the solid state by cold; frozen water. It is a white or transparent colorless substance, crystalline, brittle, and viscoidal. Its specific gravity (0.92, that of water at 4° C. being 1.0) being less than that of water, ice floats.

A plant (Mesembryanthemum crystallinum), sprinkled with pellucid, watery vesicles, which glisten like ice. It is native along the Mediterranean, in the Canaries, and in South Africa. Its juice is said to be demulcent and diuretic; its ashes are used in Spain in making glass. Ice-skater = one who skates on ice wearing a…