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Half turned round; half inverted; (Crystallog.) having a twinned structure.

Twin composition in crystals.

n arterial blood, it is always combined with oxygen, and is then called oxyhemoglobin. It crystallizes under different forms from different animals, and when crystallized, is called hæmatocrystallin. See Blood crystal, under Blood.

The sulphate of iodoquinine, a substance crystallizing in thin plates remarkable for their effects in polarizing light.

A rare fluophosphate of glucina, in small white crystals.

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.

Zeolite family, often occurring in amygdaloid, in foliated masses, and also in monoclinic crystals with pearly luster on the cleavage face. It is a hydrous silicate of alumina and lime.

Having six sides and six angles; six-sided. Hexagonal system. (Crystal.) See under Crystallization.

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.

A hydrous phosphate of zinc in transparent prismatic crystals.

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 hunting watch, or one of which the crystal is protected by a metallic cover. Hunter's room, the lunation after the harvest moon. -- Hunter's screw (Mech.), a differential screw, so named from the inventor. See under Differential.

Glassy; resembling glass; consisting of glass; transparent, like crystal. "Hyaline spaces." Carpenter.

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.

he union of water with some other substance, generally forming a neutral body, as certain crystallized salts.

chemically combined with some substance to form a hydrate; -- distinguished from water of crystallization.