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curve or very obtuse angle in the upper surface of any member, as of a timber laid horizontally; -- the opposite of camber.

Meteoric iron; a meteorite consisting of metallic iron without stony matter.

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

Parallel to the horizon; on a level; as, a horizontalline or surface.

rapid-fire gun of oil-tempered steel, having a rectangular breechblock which moves horizontally or vertically in a mortise cut completely through the jacket. It is made in France.

ellent 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.

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.

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

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

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

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

Hydrogen; -- called also in view of its supposed metallic nature. Graham.

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.

A hydrous salt; a salt combined with water of hydration or crystallization.

Containing water of hydration or crystallization.

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.

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