Webster's Unabridged Dictionary - Letter H - Page 58

Hydrofluate (n.) A supposed compound of hydrofluoris acid and a base; a fluoride.

Hydrofluoric (a.) Pertaining to, or containing, hydrogen and fluorine; fluohydric; as, hydrofluoric acid.

Hydrofluosilicate (n.) A salt of hydrofluosilic acid; a silicofluoride. See Silicofluoride.

Hydrofluosilicic (a.) Pertaining to, or denoting, a compound consisting of a double fluoride of hydrogen and silicon; silicofluoric. See Silicofluoric.

Hydrogalvanic (a.) Pertaining to, produced by, or consisting of, electricity evolved by the action or use of fluids; as, hydrogalvanic currents.

Hydrogen (n.) A gaseous element, colorless, tasteless, and odorless, the lightest known substance, being fourteen and a half times lighter than air (hence its use in filling balloons), and over eleven thousand times lighter than water. It is very abundant, being an ingredient of water 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 combining weights, and also of valence, being the typical monad. Symbol H. Atomic weight 1.

Hydrogenated (imp. & p. p.) of Hydrogenate

Hydrogenating (p. pr. & vb. n.) of Hydrogenate

Hydrogenate (v. t.) To hydrogenize.

Hydrogenation (n.) The act of combining with hydrogen, or the state of being so combined.

Hydrogenide (n.) A binary compound containing hydrogen; a hydride. [R.] See Hydride.

Hydrogenium (n.) Hydrogen; -- called also in view of its supposed metallic nature.

Hydrogenized (imp. & p. p.) of Hydrogenize

Hydrogenizing (p. pr. & vb. n.) of Hydrogenize

Hydrogenize (v. t.) To combine with hydrogen; to treat with, or subject to the action of, hydrogen; to reduce; -- contrasted with oxidize.

Hydrogenous (a.) Of or pertaining to hydrogen; containing hydrogen.

Hydrognosy (n.) A treatise upon, or a history and description of, the water of the earth.

Hydrogode (n.) The negative pole or cathode.

Hydrographer (n.) One skilled in the hydrography; one who surveys, or draws maps or charts of, the sea, lakes, or other waters, with the adjacent shores; one who describes the sea or other waters.

Hydrographic (a.) Alt. of Hydrographical

Hydrographical (a.) Of or relating to hydrography.

Hydrography (n.) The art of measuring and describing the sea, lakes, rivers, and other waters, with their phenomena.

Hydrography (n.) That branch of surveying which embraces the determination of the contour of the bottom of a harbor or other sheet of water, the depth of soundings, the position of channels and shoals, with the construction of charts exhibiting these particulars.

Hydroguret (n.) A hydride.

Hydroid (a.) Related to, or resembling, the hydra; of or pertaining to the Hydroidea.

Hydroid (n.) One of the Hydroideas.

Hydroidea (n. pl.) An extensive order of Hydrozoa or Acalephae.

Hydrokinetic (a.) Of or pertaining to the motions of fluids, or the forces which produce or affect such motions; -- opposed to hydrostatic.

Hydrological (a.) Of or pertaining to hydrology.

Hydrologist (n.) One skilled in hydrology.

Hydrology (n.) The science of water, its properties, phenomena, and distribution over the earth's surface.

Hydrolytic (a.) Tending to remove or separate water; eliminating water.

Hydromagnesite (n.) A hydrous carbonate of magnesia occurring in white, early, amorphous masses.

Hydromancy (n.) Divination by means of water, -- practiced by the ancients.

Hydromantic (a.) Of or pertaining to divination by water.

Hydromechanics (n.) That branch of physics which treats of the mechanics of liquids, or of their laws of equilibrium and of motion.

Hydromedusae (pl. ) of Hydromedusa

Hydromedusa (n.) Any medusa or jellyfish which is produced by budding from a hydroid. They are called also Craspedota, and naked-eyed medusae.

Hydromel (n.) A liquor consisting of honey diluted in water, and after fermentation called mead.

Hydromellonic (a.) See Cyamellone.

Hydrometallurgical (a.) Of or pertaining to hydrometallurgy; involving the use of liquid reagents in the treatment or reduction of ores.

Hydrometallurgy (n.) The art or process of assaying or reducing ores by means of liquid reagents.

Hydrometeor (n.) A meteor or atmospheric phenomenon dependent upon the vapor of water; -- in the pl., a general term for the whole aqueous phenomena of the atmosphere, as rain, snow, hail, etc.

Hydrometeorological (a.) Of or pertaining to hydrometeorology, or to rain, clouds, storms, etc.

Hydrometeorology (n.) That branch of meteorology which relates to, or treats of, water in the atmosphere, or its phenomena, as rain, clouds, snow, hail, storms, etc.

Hydrometer (n.) An instrument for determining the specific gravities of liquids, and thence the strength spirituous liquors, saline solutions, etc.

Hydrometer (n.) An instrument, variously constructed, used for measuring the velocity or discharge of water, as in rivers, from reservoirs, etc., and called by various specific names according to its construction or use, as tachometer, rheometer, hydrometer, pendulum, etc.; a current gauge.

Hydrometric (a.) Alt. of Hydrometrical

Hydrometrical (a.) Of or pertaining to an hydrometer, or to the determination of the specific gravity of fluids.

Hydrometrical (a.) Of or pertaining to measurement of the velocity, discharge, etc., of running water.

Hydrometrical (a.) Made by means of an hydrometer; as, hydrometric observations.

Hydrometrograph (n.) An instrument for determining and recording the quantity of water discharged from a pipe, orifice, etc., in a given time.

Hydrometry (n.) The art of determining the specific gravity of liquids, and thence the strength of spirituous liquors, saline solutions, etc.

Hydrometry (n.) The art or operation of measuring the velocity or discharge of running water, as in rivers, etc.

Hydromica (n.) A variety of potash mica containing water. It is less elastic than ordinary muscovite.

Hydronephrosis (n.) An accumulation of urine in the pelvis of the kidney, occasioned by obstruction in the urinary passages.

Hydropath (n.) A hydropathist.

Hydropathic (a.) Alt. of Hydropathical

Hydropathical (a.) Of or pertaining to hydropathy.

Hydropathist (n.) One who practices hydropathy; a water-cure doctor.

Hydropathy (n.) The water cure; a mode of treating diseases by the copious and frequent use of pure water, both internally and externally.

Hydroperitoneum (n.) Same as Ascites.

Hydrophane (n.) A semitranslucent variety of opal that becomes translucent or transparent on immersion in water.

Hydrophanous (a.) Made transparent by immersion in water.

Hydrophid (n.) Any sea snake of the genus Hydrophys and allied genera. These snakes are venomous, live upon fishes, and have a flattened tail for swimming.

Hydrophlorone (n.) A white, crystalline benzene derivative, C8H10O2, obtained by the reduction of phlorone.

Hydrophobia (n.) An abnormal dread of water, said to be a symptom of canine madness; hence:

Hydrophobia (n.) The disease caused by a bite form, or inoculation with the saliva of, a rabid creature, of which the chief symptoms are, a sense of dryness and construction in the throat, causing difficulty in deglutition, and a marked heightening of reflex excitability, producing convulsions whenever the patient attempts to swallow, or is disturbed in any way, as by the sight or sound of water; rabies; canine madness.

Hydrophobic (a.) Of or pertaining to hydrophobia; producing or caused by rabies; as, hydrophobic symptoms; the hydrophobic poison.

Hydrophoby (n.) See Hydrophobia.

Hydrophora (n. pl.) The Hydroidea.

Hydrophore (n.) An instrument used for the purpose of obtaining specimens of water from any desired depth, as in a river, a lake, or the ocean.

Hydrophyllia (pl. ) of Hydrophyllium

Hydrophylliums (pl. ) of Hydrophyllium

Hydrophyllium (n.) One of the flat, leaflike, protective zooids, covering other zooids of certain Siphonophora.

Hydrophyte (n.) An aquatic plant; an alga.

Hydrophytology (n.) The branch of botany which treats of water plants.

Hydropic (a.) Alt. of Hydropical

Hydropical (a.) Dropsical, or resembling dropsy.

Hydropically (adv.) In a hydropical manner.

Hydropiper (n.) A species (Polygonum Hydropiper) of knotweed with acrid foliage; water pepper; smartweed.

Hydropneumatic (a.) Pertaining to, or depending upon, both liquid and gaseous substances; as, hydropneumatic apparatus for collecting gases over water or other liquids.

Hydropsy (n.) Same as Dropsy.

Hydropult (n.) A machine for throwing water by hand power, as a garden engine, a fire extinguisher, etc.

Hydroquinone (n.) 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.

Hydrorhizae (pl. ) of Hydrorhiza

Hydrorhizas (pl. ) of Hydrorhiza

Hydrorhiza (n.) The rootstock or decumbent stem by which a hydroid is attached to other objects. See Illust. under Hydroidea.

Hydrosalt (n.) A salt supposed to be formed by a hydracid and a base.

Hydrosalt (n.) An acid salt.

Hydrosalt (n.) A hydrous salt; a salt combined with water of hydration or crystallization.

Hydroscope (n.) An instrument designed to mark the presence of water, especially in air.

Hydroscope (n.) A kind of water clock, used anciently for measuring time, the water tricking from an orifice at the end of a graduated tube.

Hydrosome (n.) Alt. of Hydrosoma

Hydrosoma (n.) All the zooids of a hydroid colony collectively, including the nutritive and reproductive zooids, and often other kinds.

Hydrosorbic (a.) Pertaining to, or designating, an acid obtained from sorbic acid when this takes up hydrogen; as, hydrosorbic acid.

Hydrostat (n.) A contrivance or apparatus to prevent the explosion of steam boilers.

Hydrostatic (a.) Alt. of Hydrostatical

Hydrostatical (a.) Of or relating to hydrostatics; pertaining to, or in accordance with, the principles of the equilibrium of fluids.

Hydrostatically (adv.) According to hydrostatics, or to hydrostatic principles.

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