Webster's Dictionary, 1913

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Hydrometallurgy noun [ Hydro- , 1 + metallurgy .] The art or process of assaying or reducing ores by means of liquid reagents.

Hydrometeor noun [ Hydro- , 1 + meteor .] A meteor or atmospheric phenomenon dependent upon the vapor of water; -- in the plural , a general term for the whole aqueous phenomena of the atmosphere, as rain, snow, hail, etc. Nichol.

Hydrometeorological adjective Of or pertaining to hydrometeorology, or to rain, clouds, storms, etc.

Hydrometeorology noun [ Hydro- , 1 + meteorology .] 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 noun [ Hydro- , 1 + -meter : confer French hydromètre .]
1. (Physics) An instrument for determining the specific gravities of liquids, and thence the strength spirituous liquors, saline solutions, etc.

» It is usually made of glass with a graduated stem, and indicates the specific gravity of a liquid by the depth to which it sinks in it, the zero of the scale marking the depth to which it sinks in pure water. Extra weights are sometimes used to adapt the scale to liquids of different densities.

2. 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, Hydrometrical adjective [ Confer French hydromètrique .]
1. Of or pertaining to an hydrometer, or to the determination of the specific gravity of fluids.

2. Of or pertaining to measurement of the velocity, discharge, etc., of running water.

3. Made by means of an hydrometer; as, hydrometric observations.

Hydrometric pendulum , a species of hydrometer consisting of a hollow ball of ivory or metal suspended by a treated from the center of a graduated quadrant, and held in a stream to measure the velocity of the water by the inclination given to the thread; a kind of current gauge.

Hydrometrograph noun [ Hydro- , 1 + Greek ... measure + -graph .] An instrument for determining and recording the quantity of water discharged from a pipe, orifice, etc., in a given time.

Hydrometry noun [ Confer French hydromètrique .]
1. The art of determining the specific gravity of liquids, and thence the strength of spirituous liquors, saline solutions, etc.

2. The art or operation of measuring the velocity or discharge of running water, as in rivers, etc.

Hydromica noun [ Hydro- , 1 + mica .] (Min.) A variety of potash mica containing water. It is less elastic than ordinary muscovite.

Hydromica schist (Min.) , a mica schist characterized by the presence of hydromica. It often has a silky luster and almost soapy feel.

Hydronephrosis noun [ New Latin , Greek "y`dwr water + ... a kidney.] (Medicine) An accumulation of urine in the pelvis of the kidney, occasioned by obstruction in the urinary passages.

Hydropath noun [ Confer French hydropathe .] A hydropathist.

Hydropathic, Hydropathical adjective Of or pertaining to hydropathy.

Hydropathist noun One who practices hydropathy; a water-cure doctor.

Hydropathy noun [ Hydro- , 1 + Greek ..., ..., to suffer.] The water cure; a mode of treating diseases by the copious and frequent use of pure water, both internally and externally.

Hydroperitoneum noun [ New Latin See Hydro- , and Peritoneum .] (Medicine) Same as Ascites .

Hydrophane noun [ Hydro- , 1 + Greek ... to show, appear: confer French hydrophane .] (Min.) A semitranslucent variety of opal that becomes translucent or transparent on immersion in water.

Hydrophanous adjective (Min.) Made transparent by immersion in water.

Hydrophid noun [ Hydro- , 1 + Greek ... a small serpent.] (Zoology) 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 noun [ Hydro- , 2 + phlorone .] (Chemistry) A white, crystalline benzene derivative, C 8 H 10 O 2 , obtained by the reduction of phlorone.

Hydrophobia noun [ Latin , from Greek ...; "y`dwr water + ... fear: confer French hydrophobie .] (Medicine) (a) An abnormal dread of water, said to be a symptom of canine madness; hence: (b) 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. [ Written also hydrophoby .]

Hydrophobic adjective [ Latin hydrophobicus , Greek ...: confer French hydrophobique .] Of or pertaining to hydrophobia; producing or caused by rabies; as, hydrophobic symptoms; the hydrophobic poison.

Hydrophoby noun See Hydrophobia .

Hydrophora noun plural [ New Latin , from English hydra + Greek ... to bear.] (Zoology) The Hydroidea.

Hydrophore noun [ Greek "y`dwr water + ... to bear.] An instrument used for the purpose of obtaining specimens of water from any desired depth, as in a river, a lake, or the ocean.

Hydrophyllium noun ; plural Latin Hydrophyllia , English Hydrophylliums . [ New Latin , from Greek "y`dwr water + ... a leaf.] (Zoology) One of the flat, leaflike, protective zooids, covering other zooids of certain Siphonophora.

Hydrophyte noun [ Greek ... + ... plant: confer French hydrophyte .] An aquatic plant; an alga.

Hydrophytology noun [ Hydro- + phyte + -logy .] The branch of botany which treats of water plants.

Hydropic, Hydropical adjective [ Latin hydropicus , Greek ...: confer French hydropique . See Dropsy .] Dropsical, or resembling dropsy.

Every lust is a kind of hydropic distemper, and the more we drink the more we shall thirst.
Tillotson.

Hydropically adverb In a hydropical manner.

Hydropiper noun [ New Latin , from Greek "y`dwr water + Latin piper a pepper.] (Botany) A species ( Polygonum Hydropiper ) of knotweed with acrid foliage; water pepper; smartweed.

Hydroplane noun [ Prefix hydro- , 1 + plane .]
1. A plane, or any of a number of planes, projecting from the hull of a submarine boat, which by being elevated or depressed cause the boat, when going ahead, to sink or rise, after the manner of an aëroplane.

2. A projecting plane or fin on a gliding boat to lift the moving boat on top of the water; also, a gliding boat.

Hydroplane intransitive verb Of a boat, to plane (see Plane , below).

Hydropneumatic adjective [ Hydro- , 1 + pneumatic : confer French hydropneumatique .] Pertaining to, or depending upon, both liquid and gaseous substances; as, hydropneumatic apparatus for collecting gases over water or other liquids.

Hydropneumatic gun carriage (Ordnance) A disappearing gun carriage in which the recoil is checked by cylinders containing liquid and air, the air when compressed furnishing the power for restoring the gun to the firing position. It is used with some English and European heavy guns.

Hydropsy noun Same as Dropsy .

Hydropult noun [ Hydro- , 1 + Greek ... to hurl.] A machine for throwing water by hand power, as a garden engine, a fire extinguisher, etc.

Hydroquinone noun [ Hydro- , 2 + quinone .] (Chemistry) A white crystalline substance, C 6 H 4 (OH) 2 , obtained by the reduction of quinone. It is a diacid phenol, resembling, and metameric with, pyrocatechin and resorcin. Called also dihydroxy benzene .

Hydrorhiza noun ; plural Latin Hydrorhizæ , English Hydrorhizas . [ New Latin , from English hydra + Greek ... a root.] (Zoology) The rootstock or decumbent stem by which a hydroid is attached to other objects. See Illust. under Hydroidea .

Hydrosalt noun [ Hydro- , 1 + salt .] (Chemistry) (a) A salt supposed to be formed by a hydracid and a base. (b) An acid salt. [ R.] (c) A hydrous salt; a salt combined with water of hydration or crystallization.

Hydroscope noun [ Hydro- , 1 + -scope .]
1. An instrument designed to mark the presence of water, especially in air. Weale.

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

Hydrosome Hy`dro*so"ma noun [ New Latin hydrosoma . See Hydra , and -some body.] (Zoology) All the zooids of a hydroid colony collectively, including the nutritive and reproductive zooids, and often other kinds.

Hydrosorbic adjective [ Hydro- , 2 + sorbic .] (Chemistry) Pertaining to, or designating, an acid obtained from sorbic acid when this takes up hydrogen; as, hydrosorbic acid.

Hydrosphere noun [ Prefix hydro- , 1 + sphere .]
1. (Meteor.) The aqueous vapor of the entire atmosphere.

2. (Physics Geology) The aqueous envelope of the earth, including the ocean, all lakes, streams, and underground waters, and the aqueous vapor in the atmosphere.

Hydrostat noun A contrivance or apparatus to prevent the explosion of steam boilers.

Hydrostat noun A device, usually electrical, for indicating or regulating the height of water in a reservoir or receptacle.

Hydrostatic, Hydrostatical adjective [ Hydro- , 1 + Greek ... causing to stand: confer French hydrostatique. See Static .] Of or relating to hydrostatics; pertaining to, or in accordance with, the principles of the equilibrium of fluids.

The first discovery made in hydrostatics since the time of Archimedes is due to Stevinus.
Hallam.

Hydrostatic balance , a balance for weighing substances in water, for the purpose of ascertaining their specific gravities. -- Hydrostatic bed , a water bed. -- Hydrostatic bellows , an apparatus consisting of a water-tight bellowslike case with a long, upright tube, into which water may be poured to illustrate the hydrostatic paradox. -- Hydrostatic paradox , the proposition in hydrostatics that any quantity of water, however small, may be made to counterbalance any weight, however great; or the law of the equality of pressure of fluids in all directions. -- Hydrostatic press , a machine in which great force, with slow motion, is communicated to a large plunger by means of water forced into the cylinder in which it moves, by a forcing pump of small diameter, to which the power is applied, the principle involved being the same as in the hydrostatic bellows. Also called hydraulic press , and Bramah press . In the illustration, a is a pump with a small plunger b , which forces the water into the cylinder c , thus driving upward the large plunder d , which performs the reduced work, such as compressing cotton bales, etc.

Hydrostatically adverb According to hydrostatics, or to hydrostatic principles. Bentley.

Hydrostatician noun One who is versed or skilled in hydrostatics. [ R.]

Hydrostatics noun [ Confer French hydrostatique .] (Physics) The branch of science which relates to the pressure and equilibrium of nonelastic fluids, as water, mercury, etc.; the principles of statics applied to water and other liquids.

Hydrosulphate noun (Chemistry) Same as Hydrosulphurent .