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A bitter, brownish yellow, amorphous substance, extracted from vegetable mold, and also produced by the action of acids on certain sugars and carbohydrates; -- called also humic acid, ulmin, gein, ulmic or geic acid, etc.

A stringled instrument, lutelike in shape, in which the sound is produced by the friction of a wheel turned by a crank at the end, instead of by a bow, two of the strings being tuned as drones, while two or more, tuned in unison, are modulated by keys.

The name also given to Scilla Peruviana, a Mediterranean plant, one variety of which produces white, and another blue, flowers; -- called also, from a mistake as to its origin, Hyacinth of Peru.

The offspring of the union of two distinct species; an animal or plant produced from the mixture of two species. See Mongrel.

To render hybrid; to produce by mixture of stocks.

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

One of a series of artificial, organic bases, usually produced as thick viscous liquids by the action of ammonia on ethylene oxide. They have the properties both of alcohol and amines.

A diseased condition produced by poisoning with hydrargyrum, or mercury; mercurialism.

Any one of a series of nitrogenous bases, resembling the amines and produced by the reduction of certain nitroso and diazo compounds; as, methyl hydrazine, phenyl hydrazine, etc. They are derivatives of hydrazine proper, H2N.NH2, which is a doubled amido group, recently (1887) isolated as a stable, colorless gas, with…

Pertaining to, or derived from, hydrogen and iodine; -- said of an acid produced by the combination of these elements. Hydriodic acid (Chem.), a pungent, colorless gas, HI, usually prepared as a solution in water. It is strong reducing agent. Called also hydrogen iodine.

Pertaining to, employed in, or produced by, the evolution of electricity by means of a battery in which water or steam is used. Hydro-electric machine (Physics), an apparatus invented by Sir William Armstrong of England for generating electricity by the escape of high-pressure steam from a series of jets connected with…

on of water of a liquid; of or pertaining to water power. Hydrodynamic friction, friction produced by the viscosity of a liquid in motion.

, HF, very corrosive in its action, and having a strong, pungent, suffocating odor. It is produced by the action of sulphuric acid on fluorite, and is usually collected as a solution in water. It attacks all silicates, as glass or porcelain, is the agent employed in etching glass, and is preserved only in vessels of pl…

Pertaining to, produced by, or consisting of, electricity evolved by the action or use of fluids; as, hydrogalvanic currents. [R.]

r and of many other substances, especially those of animal or vegetable origin. It may by produced in many ways, but is chiefly obtained by the action of acids (as sulphuric) on metals, as zinc, iron, etc. It is very inflammable, and is an ingredient of coal gas and water gas. It is standard of chemical equivalents or…

Of or pertaining to the motions of fluids, or the forces which produce or affect such motions; -- opposed to hydrostatic. Sir W. Thomson.

Any medusa or jellyfish which is produced by budding from a hydroid. They are called also Craspedota, and naked-eyed medusæ.

A nitrogenous, organic base, NH2.OH, resembling ammonia, and produced by a modified reduction of nitric acid. It is usually obtained as a volatile, unstable solution in water. It acts as a strong reducing agent.

xed points, called foci, is equal to a given distance. See Focus. If the cutting plane be produced so as to cut the opposite cone, another curve will be formed, which is also an hyperbola. Both curves are regarded as branches of the same hyperbola. See Illust. of Conic section, and Focus.

Having the quality of producing sleep; tending to produce sleep; soporific.