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hydro
/huy"droh/, n., pl. hydros for 2, 3, adj. n. 1. Informal. hydroelectric power. 2. Informal. hydroplane. 3. Brit. a. a bathhouse, hotel, or resort catering to people taking ...
hydro-
hydro-1 a combining form meaning "water," used in the formation of compound words: hydroplane; hydrogen. Also, esp. before a vowel, hydr-1. [ < Gk, comb. form of hýdor ...
hydro-ski
/huy"droh skee'/, n., pl. hydro-skis. a hydrofoil attached to a seaplane to aid in takeoffs and landings. [1950-55] * * *
hydroa
/huy droh"euh/, n. Pathol. any skin condition characterized by red vesicular areas. [ < NL < Gk hídroia (pl.) heat spots (lit., sweat eggs), equiv. to hidr(ós) sweat + -oia, ...
hydroaerobics
/huy'droh air roh"biks/, n. (used with a plural verb) aerobic exercises performed in water, as in a swimming pool. [HYDRO- + AEROBICS] * * *
hydroairplane
/huy'droh air"playn'/, n. a hydroplane. [1905-10; HYDRO-1 + AIRPLANE] * * *
hydrobiological
See hydrobiology. * * *
hydrobiologist
See hydrobiological. * * *
hydrobiology
—hydrobiological /huy'dreuh buy'euh loj"i keuhl/, hydrobiologic, adj. —hydrobiologically, adv. —hydrobiologist, n. /huy'droh buy ol"euh jee/, n. the study of aquatic ...
hydrobomb
/huy"dreuh bom'/, n. an aerial torpedo equipped with a rocket engine that propels it after the torpedo has entered the water. [HYDRO-1 + BOMB] * * *
hydrobromic
/huy'dreuh broh"mik/, adj. Chem. of or derived from hydrobromic acid. [1830-40; HYDRO-2 + BROMIC] * * *
hydrobromic acid
a colorless or faintly yellow corrosive liquid, HBr, an aqueous solution of hydrogen bromide. [1830-40] * * *
hydrobromicacid
hy·dro·bro·mic acid (hī'drə-brōʹmĭk) n. A clear, colorless or faintly yellow, highly acidic and corrosive aqueous solution of hydrogen bromide, HBr, used in the ...
hydrobromide
/huy'dreuh broh"muyd, -mid/, n. a salt formed by the direct union of hydrobromic acid and an organic base, esp. an alkaloid, usually more soluble than the base. [1875-80; ...
hydrocarbon
—hydrocarbonaceous, adj. /huy'dreuh kahr"beuhn, huy"dreuh kahr'-/, n. any of a class of compounds containing only hydrogen and carbon, as an alkane, methane, CH4, an alkene, ...
hydrocarbonaceous
See hydrocarbon. * * *
hydrocarbonic
See hydrocarbonaceous. * * *
hydrocarbonous
See hydrocarbonaceous. * * *
hydrocast
hy·dro·cast (hīʹdrə-kăst') n. The process of using a device consisting of several water-collection bottles, such as Nansen bottles, that are wired and clamped together and ...
hydrocele
/huy"dreuh seel'/, n. Pathol. an accumulation of serous fluid, usually about the testis. [1590-1600; < L < Gk hydrokéle. See HYDRO-1, -CELE1] * * * ▪ ...
hydrocellulose
/huy'dreuh sel"yeuh lohs'/, n. a gelatinous substance obtained by the partial hydrolysis of cellulose, used chiefly in the manufacture of paper, mercerized cotton, and viscose ...
hydrocephalic
/huy'droh seuh fal"ik/, adj. Pathol. of or pertaining to hydrocephalus. Also, hydrocephalous /huy'dreuh sef"euh leuhs/. [1805-15; HYDROCEPHAL(US) + -IC] * * *
hydrocephaloid
/huy'dreuh sef"euh loyd'/, adj. Pathol. resembling hydrocephalus. [1835-45; HYDROCEPHAL(US) + -OID] * * *
hydrocephalous
See hydrocephalic. * * *
hydrocephalus
/huy'dreuh sef"euh leuhs/, n. Pathol. an accumulation of serous fluid within the cranium, esp. in infancy, due to obstruction of the movement of cerebrospinal fluid, often ...
Hydrocharitaceae
▪ plant family  the frog's-bit family of monocotyledonous flowering plants, with 18 genera of submerged and emergent, freshwater and saltwater aquatic herbs, mainly of warmer ...
hydrochloric
/huy'dreuh klawr"ik, -klohr"-/, adj. of or derived from hydrochloric acid. [1810-20; HYDRO-2 + CHLORIC] * * *
hydrochloric acid
a colorless or faintly yellow, corrosive, fuming liquid, HCl, used chiefly in chemical and industrial processes. [1825-35] * * * or muriatic acid Solution in water of hydrogen ...
hydrochloricacid
hy·dro·chlo·ric acid (hī'drə-klôrʹĭk, -klōrʹ-) n. A clear, colorless, fuming, poisonous, highly acidic aqueous solution of hydrogen chloride, HCl, used as a chemical ...
hydrochloride
/huy'dreuh klawr"uyd, -id, -klohr"-/, n. a salt, esp. of an alkaloid, formed by the direct union of hydrochloric acid with an organic base that makes the organic constituent more ...
hydrochlorothiazide
/huy'dreuh klawr'euh thuy"euh zuyd', -klohr"-/, n. Pharm. a crystalline, water-insoluble powder, C7H8ClN3O4S2, used as a diuretic and in the treatment of hypertension. [1955-60; ...
hydrocinnamic acid
/huy"droh si nam"ik, -dreuh sin"euh mik, huy'-/ a white crystalline compound, C9H10O2, with a floral odor, used in perfumes and flavoring. [HYDRO-2 + CINNAMIC] * * *
hydrocinnamic aldehyde
a colorless liquid, C9H10O, having a floral odor, used in perfumery and flavoring. Also, hydrocinnamaldehyde /huy"droh sin'euh mal"deuh huyd'/. * * *
Hydrocleys
▪ plant genus       genus of perennial aquatic plants of the family Limnocharitaceae, consisting of three or four species, all native to tropical America. The water ...
hydrocolloid
—hydrocolloidal /huy'droh keuh loyd"l/, adj. /huy'dreuh kol"oyd/, n. a substance that forms a colloid when combined with water. [1925-30; HYDRO-1 + COLLOID] * * *
hydrocolloidal
See hydrocolloid. * * *
hydrocooling
/huy"droh kooh'ling/, n. the process or technique of arresting the ripening of fruits and vegetables after harvesting by immersion in ice water. [1940-45; HYDRO-1 + COOL + ...
hydrocoral
/huy'dreuh kawr"euhl, -kor"-/, n. any colonial marine animal of the hydrozoan order Stylasterina having a calcareous skeleton resembling that of the true corals. [ < NL ...
hydrocortisone
/huy'dreuh kawr"teuh zohn', -sohn'/, n. 1. Biochem. a steroid hormone, C21H30O5, of the adrenal cortex, active in carbohydrate and protein metabolism. 2. Pharm. Also called ...
hydrocrack
hy·dro·crack (hīʹdrə-krăk') tr.v. hy·dro·cracked, hy·dro·crack·ing, hy·dro·cracks To break down (a hydrocarbon) by the process of ...
hydrocracker
/huy"dreuh krak'euhr/, n. a high-pressure processing unit used for hydrocracking. [1960-65; HYDROCRACK(ING) + -ER1] * * *
hydrocracking
/huy"dreuh krak'ing/, n. the cracking of petroleum or the like in the presence of hydrogen. [1935-40; HYDRO-2 + CRACKING] * * *
hydrocyanic
/huy'droh suy an"ik/, adj. of or derived from hydrocyanic acid. [1810-20; HYDRO-2 + CYANIC] * * *
hydrocyanic acid
a colorless, highly poisonous liquid, HCN, an aqueous solution of hydrogen cyanide. Also called prussic acid. [1810-20] * * *
hydrocyanicacid
hy·dro·cy·an·ic acid (hī'drō-sī-ănʹĭk) n. An aqueous solution of hydrogen cyanide. Also called prussic acid. * * *
hydrodesulfurization
/huy'droh dee sul'fyeuhr euh zay"sheuhn, -feuhr euh-/, n. desulfurization by catalytic agents of the sulfur-rich hydrocarbons obtained from petroleum or the like during cracking ...
Hydrodictyon
      genus of green algae known as water nets (water net) (q.v.). * * *
HydroDiuril
/huy'droh duy"euhr il/, Pharm., Trademark. a brand of hydrochlorothiazide. * * *
hydrodynamic
—hydrodynamically, adv. /huy'droh duy nam"ik, -di-/, adj. 1. pertaining to forces in or motions of liquids. 2. of or pertaining to hydrodynamics. [1770-80; HYDRO-1 + DYNAMIC] * ...
hydrodynamically
See hydrodynamic. * * *
hydrodynamicist
/huy'droh duy nam"euh sist, -di-/, n. a specialist in hydrodynamics. [1960-65; HYDRODYNAMIC(S) + -IST] * * *
hydrodynamics
/huy'droh duy nam"iks, -di-/, n. (used with a sing. v.) the branch of fluid dynamics that deals with liquids, including hydrostatics and hydrokinetics. Also called ...
hydroelectric
—hydroelectricity /huy'droh i lek tris"i tee, -ee'lek-/, n. /huy'droh i lek"trik/, adj. pertaining to the generation and distribution of electricity derived from the energy of ...
hydroelectric power
Electricity produced from generators driven by water turbines that convert the energy in falling or fast-flowing water to mechanical energy. Water at a higher elevation flows ...
hydroelectrically
See hydroelectric. * * *
hydroelectricity
See hydroelectrically. * * *
hydrofluoric
/huy'dreuh floor"ik, -flawr"-, -flor"-/, adj. of or derived from hydrofluoric acid. [1815-25; HYDRO-2 + -FLUORIC] * * *
hydrofluoric acid
a colorless, fuming, corrosive liquid, HF, an aqueous solution of hydrogen fluoride, used chiefly for etching glass. [1815-25] * * *
hydrofluoricacid
hy·dro·fluor·ic acid (hī'drō-flo͝orʹĭk, -flôrʹ-, -flōrʹ-) n. A colorless, fuming, corrosive, dangerously poisonous aqueous solution of hydrogen fluoride, HF, used to ...
hydrofoil
/huy"dreuh foyl'/, n. 1. Naval Archit. a surface form creating a thrust against water in a direction perpendicular to the plane approximated by the surface. 2. Naut. a. a ...
hydroformer
See hydroforming. * * *
hydroforming
/huy"dreuh fawr'ming/, n. the production of high-octane aromatic compounds for motor fuels by catalytic reforming of naphthas in the presence of hydrogen. [1931; HYDRO-2 + ...
hydroformylation
/huy'dreuh fawr'meuh lay"sheuhn/, n. the addition of a hydrogen atom and the formyl group to a double bond of a hydrocarbon by reaction with a mixture of carbon monoxide and ...
hydrofracturing
/huy'dreuh frak"cheuh ring/, n. a method of increasing the permeability of rocks penetrated by an oil or gas well by pumping in water and sand under pressure to open up cracks in ...
hydrogasification
hydrogasification [hī΄drō gas΄i fi kā′shən] n. a high-temperature, high-pressure process for producing liquid or gaseous fuels from fine particles of coal and hydrogen ...
hydrogel
/huy"dreuh jel'/, n. a gel whose liquid constituent is water. [1890-95; HYDRO-1 + GEL] * * *
hydrogen
/huy"dreuh jeuhn/, n. a colorless, odorless, flammable gas that combines chemically with oxygen to form water: the lightest of the known elements. Symbol: H; at. wt.: 1.00797; ...
hydrogen bomb
a bomb, more powerful than an atomic bomb, that derives its explosive energy from the thermonuclear fusion reaction of hydrogen isotopes. Also called H-bomb, fusion bomb, ...
hydrogen bond
a type of chemical bond in which a hydrogen atom that has a covalent link with one of the electronegative atoms (F, N, O) forms an electrostatic link with another electronegative ...
hydrogen bonding
Interaction involving a hydrogen atom located between a pair of other atoms having a high affinity for electrons; such a bond is weaker than an ionic bond or covalent bond but ...
hydrogen bromide
a colorless gas, HBr, having a pungent odor: the anhydride of hydrobromic acid. [1895-1900] * * *
hydrogen chloride
a colorless gas, HCl, having a pungent odor: the anhydride of hydrochloric acid. [1865-70] * * * ▪ chemical compound       (HCl), a compound of the elements hydrogen ...
hydrogen cloud
▪ astronomy also spelled  H I region  or  H i region        in astronomy, interstellar matter composed of neutral hydrogen atoms. Most of the matter between the ...
hydrogen cyanide
a colorless poisonous gas, HCN, having a bitter almondlike odor: in aqueous solution it forms hydrocyanic acid. [1880-85] * * * ▪ chemical compound also called  formonitrile ...
hydrogen electrode
a standard reference electrode with a potential of zero, used in pH measurements, consisting of a platinum-black surface covered with hydrogen bubbles. [1895-1900] * * *
hydrogen fluoride
a colorless corrosive gas, HF, the anhydride of hydrofluoric acid, used chiefly as a catalyst and in the fluorination of hydrocarbons. [1905-10] * * *
hydrogen iodide
a colorless gas, HI, having a suffocating odor: the anhydride of hydriodic acid. [1895-1900] * * *
hydrogen ion
ionized hydrogen of the form H+, found in aqueous solutions of all acids. [1895-1900] * * * ▪ chemistry       strictly, the nucleus of a hydrogen atom separated from ...
hydrogen peroxide
a colorless, unstable, oily liquid, H2O2, an aqueous solution of which is used chiefly as an antiseptic and a bleaching agent. [1870-75] * * * ▪ chemical ...
hydrogen sulfide
a colorless, flammable, water-soluble, cumulatively poisonous gas, H2S, having the odor of rotten eggs: used chiefly in the manufacture of chemicals, in metallurgy, and as a ...
hydrogenase
hy·drog·e·nase (hī-drŏjʹə-nās', -nāz') n. An enzyme in certain microorganisms that catalyzes the hydrolysis or reduction of a substrate by molecular hydrogen. * * *
hydrogenate
—hydrogenation, n. /huy"dreuh jeuh nayt', huy droj"euh-/, v.t., hydrogenated, hydrogenating. to combine or treat with hydrogen, esp. to add hydrogen to the molecule of (an ...
hydrogenation
Chemical reaction between molecular hydrogen (H2) and another element or a compound, usually in the presence of a catalyst. It may involve adding hydrogen at the sites of double ...
hydrogenbomb
hydrogen bomb n. An explosive weapon of enormous destructive power caused by the fusion of the nuclei of various hydrogen isotopes in the formation of helium nuclei. * * *
hydrogenbond
hydrogen bond n. A chemical bond in which a hydrogen atom of one molecule is attracted to an electronegative atom, especially a nitrogen, oxygen, or flourine atom, usually of ...
hydrogenbromide
hydrogen bromide n. An irritating colorless gas, HBr, used in the manufacture of barbiturates and synthetic hormones. * * *
hydrogenchloride
hydrogen chloride n. A colorless, fuming, corrosive suffocating gas, HCl, used in the manufacture of plastics. * * *
hydrogencyanide
hydrogen cyanide n. A colorless, volatile, extremely poisonous flammable liquid, HCN, miscible in water and used in the manufacture of dyes, fumigants, and plastics. It becomes a ...
hydrogenfluoride
hydrogen fluoride n. A colorless, fuming corrosive liquid or a highly soluble corrosive gas, HF, used in the manufacture of hydrofluoric acid, as a reagent, catalyst, and ...
hydrogeniodide
hydrogen iodide n. A corrosive, colorless suffocating gas, HI, used to manufacture hydriodic acid. * * *
hydrogenion
hydrogen ion n. The positively charged ion of hydrogen, H+, formed by removal of the electron from atomic hydrogen and found in all aqueous solutions of acids. * * *
hydrogenize
—hydrogenization, n. /huy"dreuh jeuh nuyz', huy droj"euh-/, v.t., hydrogenized, hydrogenizing. hydrogenate. Also, esp. Brit., hydrogenise. [HYDROGEN + -IZE] * * *
hydrogenolysis
/huy'droh jeuh nol"euh sis/, n., pl. hydrogenolyses /-seez'/. decomposition of a compound resulting from its interaction with hydrogen. [1930-35; HYDROGEN + -O- + -LYSIS] * * *
hydrogenous
/huy droj"euh neuhs/, adj. of or containing hydrogen. [1785-95; HYDROGEN + -OUS] * * *
hydrogenperoxide
hydrogen peroxide n. A colorless, heavy, strongly oxidizing liquid, H2O2, capable of reacting explosively with combustibles and used principally in aqueous solution as a mild ...
hydrogensulfide
hydrogen sulfide n. A colorless, flammable poisonous gas, H2S, having a characteristic rotten-egg odor and used as an antiseptic, a bleach, and a reagent. * * *
hydrogeologic
See hydrogeological. * * *
hydrogeological
See hydrogeology. * * *
hydrogeologist
See hydrogeological. * * *
hydrogeology
—hydrogeological /huy'dreuh jee'euh loj"i keuhl/, hydrogeologic, adj. —hydrogeologist, n. /huy'droh jee ol"euh jee/, n. the science dealing with the occurrence and ...
hydrograph
/huy"dreuh graf', -grahf'/, n. a graph of the water level or rate of flow of a body of water as a function of time, showing the seasonal change. [1890-95; HYDRO-1 + -GRAPH] * * *
hydrographer
See hydrography. * * *
hydrographic
See hydrographer. * * *
hydrographically
See hydrographer. * * *
hydrography
—hydrographer, n. —hydrographic /huy'dreuh graf"ik/, hydrographical, adj. —hydrographically, adv. /huy drog"reuh fee/, n. 1. the science of the measurement, description, ...
hydroid
/huy"droyd/, adj. 1. noting or pertaining to that form of hydrozoan that is asexual and grows into branching colonies by budding. n. 2. the phase of a hydrozoan coelenterate that ...
hydrokinetic
/huy'droh ki net"ik, -kuy-/, adj. 1. pertaining to the motion of liquids. 2. of or pertaining to hydrokinetics. Also, hydrokinetical. [1870-75; HYDRO-1 + KINETIC] * * *
hydrokinetics
/huy'droh ki net"iks, -kuy-/, n. (used with a sing. v.) the branch of hydrodynamics that deals with the laws governing liquids or gases in motion. [1870-75; see HYDROKINETIC, ...
HYDROLANT
/huy"dreuh lant'/, n. an urgent warning of navigational dangers in the Atlantic Ocean, issued by the U.S. Navy Hydrographic Office. Cf. HYDROPAC. [HYDRO-1 + (AT)LANT(IC)] * * *
hydrolase
/huy"dreuh lays', -layz'/, n. Biochem. an enzyme that catalyzes hydrolysis. Also called hydrolyst /huy"dreuh list/. [1920-25; HYDR-1 + -OL1+ -ASE] * * * ▪ class of ...
hydrologic
See hydrology. * * *
hydrologic cycle
the natural sequence through which water passes into the atmosphere as water vapor, precipitates to earth in liquid or solid form, and ultimately returns to the atmosphere ...
hydrologic sciences
Introduction       the fields of study concerned with the waters of the Earth. Included are the sciences of hydrology, oceanography, limnology, and ...
hydrological
See hydrologic. * * *
hydrological map
▪ cartography       chart showing such hydrologic features as rivers and streams; the purpose and content of these maps vary according to the country of their origin. ...
hydrologically
See hydrologic. * * *
hydrologiccycle
hydrologic cycle n. See water cycle. * * *
hydrologist
See hydrologic. * * *
hydrology
—hydrologic /huy'dreuh loj"ik/, hydrological, adj. —hydrologically, adv. —hydrologist, n. /huy drol"euh jee/, n. 1. the science dealing with the occurrence, circulation, ...
hydrolysate
/huy drol"euh sayt'/, n. any compound formed by hydrolysis. [1910-15; HYDROLYS(IS) + -ATE2] * * *
hydrolysis
/huy drol"euh sis/, n., pl. hydrolyses /-seez'/. chemical decomposition in which a compound is split into other compounds by reacting with water. [1875-80; HYDRO-1 + -LYSIS] * * ...
hydrolyte
/huy"dreuh luyt'/, n. a substance subjected to hydrolysis. [1875-80; HYDRO-1 + -LYTE1] * * *
hydrolytic
/huy'dreuh lit"ik/, adj. producing, noting, or resulting in hydrolysis. [1870-75; HYDRO-1 + -LYTIC] * * *
hydrolyzable
See hydrolyze. * * *
hydrolyzation
See hydrolyzable. * * *
hydrolyze
—hydrolyzable, adj. —hydrolyzation, n. —hydrolyzer, n. /huy"dreuh luyz'/, v.t., v.i., hydrolyzed, hydrolyzing. to subject or be subjected to hydrolysis. Also, esp. Brit., ...
hydrolyzed vegetable protein
a vegetable protein broken down into amino acids and used as a food additive to enhance flavor, esp. in soups, sauces, and processed meats. Abbr.: HVP, H.V.P. * * *
hydromagnetic
See hydromagnetics. * * *
hydromagnetics
/huy'droh mag net"iks/, n. (used with a sing. v.) magnetohydrodynamics. [1950-55; HYDRO-1 + MAGNETICS] * * *
hydromancy
—hydromancer, n. —hydromantic, adj. /huy"dreuh man'see/, n. divination by means of the motions or appearance of water. [1585-95; earlier hydromantie, -cie ( < MF)
hydromechanical
See hydromechanics. * * *
hydromechanics
—hydromechanical, adj. /huy'droh meuh kan"iks/, n. (used with a sing. v.) hydrodynamics. [1815-25; HYDRO-1 + MECHANICS] * * *
hydromedusa
—hydromedusan, adj. /huy'droh mi dooh"seuh, -zeuh, -dyooh"-/, n., pl. hydromedusae /-see/. the medusa form of a hydrozoan. [1885-90; < NL; see HYDRA, -O-, MEDUSA] * * *
hydromel
/huy"dreuh mel'/, n. a liquor consisting of honey and water that, when fermented, becomes mead. [1555-65; < L < Gk hydrómeli, equiv. to hydro- HYDRO-1 + méli honey; r. late ME ...
hydrometallurgical
See hydrometallurgy. * * *
hydrometallurgy
—hydrometallurgical, adj. /huy'dreuh met"l err'jee/, n. the technique or process of extracting metals at ordinary temperatures by leaching ore with liquid solvents. [1885-90; ...
hydrometeor
/huy'dreuh mee"tee euhr, -awr'/, n. liquid water or ice in the atmosphere in various forms, as rain, ice crystals, hail, fog, or clouds. Cf. lithometeor. [1855-60; HYDRO-1 + ...
hydrometeorological
See hydrometeorology. * * *
hydrometeorologist
See hydrometeorological. * * *
hydrometeorology
—hydrometeorologist, n. —hydrometeorological /huy'dreuh mee'tee euhr euh loj"i keuhl/, adj. /huy'dreuh mee'tee euh rol"euh jee/, n. the study of atmospheric water, esp. ...
hydrometer
—hydrometric /huy'dreuh me"trik/, hydrometrical, adj. —hydrometry, n. /huy drom"i teuhr/, n. an instrument for determining the specific gravity of a liquid, commonly ...
hydrometric
See hydrometer. * * *
hydrometrical
See hydrometric. * * *
hydrometrically
See hydrometric. * * *
hydrometry
See hydrometric. * * *
hydromorphic
/huy'dreuh mawr"fik/, adj. of or pertaining to soil having characteristics that are developed when there is excess water all or part of the time. [1935-40; HYDRO-1 + -MORPHIC] * ...
hydromulch
/huy"dreuh mulch'/, v.t. to spread mulch on (a field, garden, etc.) in a stream of water propelled through a hose. [HYDRO-1 + MULCH] * * *
hydronaut
/huy"dreuh nawt', -not'/, n. a person trained to work in deep-sea vessels for research and rescue purposes. [1965-70, Amer.; HYDRO-1 + (AERO)NAUT] * * *
hydronephrosis
/huy'droh neuh froh"sis/, n. Pathol. dilation of the branches and pelvic cavity of the kidney, caused by an accumulation of urine resulting from obstruction of normal ...
hydronic
/huy dron"ik/, adj. of or pertaining to a heating system for a building in which the medium for carrying heat throughout the structure is circulating water, esp. when the ...
hydronitrogen
/huy'dreuh nuy"treuh jeuhn/, n. a chemical compound containing only hydrogen and nitrogen. [HYDRO-2 + NITROGEN] * * *
hydronium
hy·dro·ni·um (hī-drōʹnē-əm) n. A hydrated hydrogen ion, H3O+. Also called hydronium ion.   [hydro- + ammonium.] * * *
hydronium ion
/huy droh"nee euhm/ the hydrogen ion bonded to a molecule of water, H3O+, the form in which hydrogen ions are found in aqueous solution. Also called oxonium ion. [ < G Hydronium ...
HYDROPAC
/huy"dreuh pak'/, n. an urgent warning of navigational dangers in the Pacific Ocean, issued by the U.S. Navy Hydrographic Office. Cf. HYDROLANT. [HYDRO-1 + PAC(IFIC)] * * *
hydropath
See hydropathic. * * *
hydropathic
See hydropathy. * * *
hydropathical
See hydropathic. * * *
hydropathist
See hydropathic. * * *
hydropathy
—hydropathic /huy'dreuh path"ik/, hydropathical, adj. —hydropathist, hydropath, n. /huy drop"euh thee/, n. the curing of disease by the internal and external use of ...
hydroperoxide
/huy'droh peuh rok"suyd/, n. any chemical compound having the general formula, ROOH, where R is an element or an organic group. [1920-25; HYDRO-2 + PEROXIDE] * * *
hydrophane
—hydrophanous /huy drof"euh neuhs/, adj. /huy"dreuh fayn'/, n. a partly translucent variety of opal, which becomes more translucent or transparent when immersed in ...
hydrophanous
See hydrophane. * * *
hydrophile
See hydrophilic. * * *
hydrophilic
/huy'dreuh fil"ik/, adj. Chem. 1. having a strong affinity for water. n. 2. See soft lens. [1900-05; HYDRO-1 + -PHILIC] * * *
hydrophilicity
See hydrophile. * * *
hydrophilous
—hydrophily, n. /huy drof"euh leuhs/, adj. Bot. 1. pollinated by the agency of water. 2. hydrophytic. [1850-55; < NL hydrophilus. See HYDRO-1, -PHILOUS] * * *
hydrophily
See hydrophilous. * * *
hydrophobe
/huy"dreuh fohb'/, n. Chem. a hydrophobic substance. [1920-25; HYDRO-1 + -PHOBE] * * *
hydrophobia
/huy'dreuh foh"bee euh/, n. 1. rabies. 2. an abnormal or unnatural dread of water. [1540-50; < LL < Gk hydrophobía. See HYDRO-1, -PHOBIA] * * *
hydrophobic
—hydrophobicity /huy'dreuh foh bis"i tee/, n. /huy'dreuh foh"bik/, adj. 1. of or pertaining to hydrophobia. 2. Chem. having little or no affinity for water. Cf. ...
hydrophobicity
See hydrophobic. * * *
hydrophone
/huy"dreuh fohn'/, n. 1. a device for locating sources of sound under water, as for detecting submarines by the noise of their engines. 2. an instrument employing the principles ...
hydrophyllaceous
/huy'droh fi lay"sheuhs/, adj. belonging to the Hydrophyllaceae, the waterleaf family of plants. Cf. waterleaf family. [ < NL Hydrophyllace(ae) (Hydrophyll(um) the type genus ...
hydrophyte
—hydrophytic /huy'dreuh fit"ik/, adj. —hydrophytism, n. /huy"dreuh fuyt'/, n. a plant that grows in water or very moist ground; an aquatic plant. [1825-35; HYDRO-1 + ...
hydrophytic
See hydrophyte. * * *
hydropic
—hydropically, adv. /huy drop"ik/, adj. Pathol. dropsical. Also, hydropical. [1580-90; < L hydropicus < Gk hydropikós, equiv. to hydrop- (s. of hýdrops) HYDROPS + -ikos -IC; ...
hydroplane
/huy"dreuh playn'/, n., v., hydroplaned, hydroplaning. n. 1. a seaplane. 2. an attachment to an airplane enabling it to glide on the water. 3. a light, high-powered boat, esp. ...
hydroplaner
/huy"dreuh play'neuhr/, n. a person who pilots a hydroplane, esp. a professional speedboat racer. [HYDROPLANE + -ER1] * * *
hydropneumatization
/huy'dreuh nooh'meuh teuh zay"sheuhn, -nyooh'-/, n. utilization of air pressure in the housing of a water turbine to keep the level of water that has been used from rising to ...
hydroponic
See hydroponics. * * *
hydroponically
See hydroponic. * * *
hydroponicist
See hydroponic. * * *
hydroponics
—hydroponic, adj. —hydroponically, adv. —hydroponist /huy drop"euh nist/, hydroponicist, n. /huy'dreuh pon"iks/, n. (used with a sing. v.) the cultivation of plants by ...
hydroponist
See hydroponic. * * *
hydropower
/huy"dreuh pow'euhr/, n. hydroelectric power. [1930-35; HYDRO-1 + POWER] * * *
hydrops
—hydroptic, adj. /huy"drops/, n. (used with a sing. v.) Pathol. (formerly) edema. Also called hydropsy /huy"drop see/. [1700-10; < L hydrops < Gk hýdrops DROPSY, equiv. to ...
hydroquinone
/huy'droh kwi nohn", -dreuh kwin"ohn/, n. Chem. a white, crystalline compound, C6H6O2, formed by the reduction of quinone: used chiefly in photography and to inhibit autoxidation ...
hydrorhiza
—hydrorhizal, adj. /huy'dreuh ruy"zeuh/, n., pl. hydrorhizae /-zee/. the rootlike base of a hydroid colony, by which it is attached to the substratum. [1860-65; < NL; see ...
hydros.
hydrostatics. * * *
hydroscope
—hydroscopic /huy'dreuh skop"ik/, hydroscopical, adj. —hydroscopicity /huy'dreuh skoh pis"i tee/, n. /huy"dreuh skohp'/, n. an optical device for viewing objects below the ...
hydroscopic
See hydroscope. * * *
hydroseed
/huy"dreuh seed'/, v.t. to sow (a field, lawn, etc.) with seed by distribution in a stream of water propelled through a hose. [HYDRO-1 + SEED] * * *
hydrosere
/huy"dreuh sear'/, n. Ecol. a sere originating in water. [1925-30; HYDRO-1 + SERE2] * * *
hydroski
hydroski [hī′drə skē΄] n. an elongated planing surface, similar to a snow ski, allowing an aircraft to take off or land on water, etc. * * *
hydrosol
/huy"dreuh sawl', -sol'/, n. Physical Chem. a colloidal suspension in water. [1860-65; HYDRO-1 + SOL(UTION)] * * *
hydrosolic
See hydrosol. * * *
hydrosoma
/huy'dreuh soh"meuh/, n., pl. hydrosomata /-meuh teuh/. Zool. hydrosome. [ < NL] * * *
hydrosome
/huy"dreuh sohm'/, n. Zool. the entire body of a compound hydrozoan. [1860-65; hydro- (comb. form repr. HYDRA) + -SOME3] * * *
hydrospace
hydrospace [hī′drō spās΄, hī′drəspās΄] n. the ocean waters and ocean depths of the earth, esp. as a realm to be explored and investigated scientifically; inner ...
hydrosphere
/huy"dreuh sfear'/, n. the water on or surrounding the surface of the globe, including the water of the oceans and the water in the atmosphere. [1885-90; HYDRO-1 + -SPHERE] * * ...
hydrospheric
See hydrosphere. * * *
hydrostat
/huy"dreuh stat'/, n. 1. an electrical device for detecting the presence of water, as from overflow or leakage. 2. any of various devices for preventing injury to a steam boiler ...
hydrostatic
—hydrostatically, adv. /huy'dreuh stat"ik/, adj. of or pertaining to hydrostatics. Also, hydrostatical. [1665-75; HYDRO-1 + STATIC] * * *
hydrostatically
See hydrostatic. * * *
hydrostatics
/huy'dreuh stat"iks/, n. (used with a sing. v.) the branch of hydrodynamics that deals with the statics of fluids, usually confined to the equilibrium and pressure of ...
hydrosulfate
/huy'dreuh sul"fayt/, n. a salt formed by the direct union of sulfuric acid with an organic base, esp. an alkaloid, and usually more soluble than the base. Also, ...
hydrosulfide
/huy'dreuh sul"fuyd, -fid/, n. a compound containing the univalent group -HS. Also, hydrosulphide. [1840-50; HYDRO-2 + SULFIDE] * * *
hydrosulfite
/huy'dreuh sul"fuyt/, n. Chem. 1. hyposulfite (def. 1). 2. See sodium hydrosulfite. Also, hydrosulphite. [1860-65; HYDROSULF(UROUS) + -ITE1] * * *
hydrosulfurous
/huy'droh sul fyoor"euhs, -dreuh sul"feuhr euhs/, adj. hyposulfurous. Also, hydrosulphurous. [1850-55; HYDRO-2 + SULFUROUS] * * *
hydrosulfurousacid
hy·dro·sul·fu·rous acid (hī'drō-sŭl-fyo͝orʹəs, -sŭlʹfər-əs) n. See hyposulfurous acid. * * *
hydrotactic
See hydrotaxis. * * *
hydrotaxis
—hydrotactic /huy'dreuh tak"tik/, adj. /huy'dreuh tak"sis/, n. Biol. oriented movement toward or away from water. [1895-1900; HYDRO-1 + -TAXIS] * * *
hydrotheca
—hydrothecal, adj. /huy'dreuh thee"keuh/, n., pl. hydrothecae /-kee/. Zool. the part of the perisarc covering a hydranth. [1870-75; < NL; see HYDRO-1, THECA] * * *
hydrotherapeutic
See hydrotherapeutics. * * *
hydrotherapeutics
—hydrotherapeutic, adj. /huy'droh ther'euh pyooh"tiks/, n. (used with a sing. v.) hydrotherapy. [1835-45; HYDRO-1 + THERAPEUTICS] * * *
hydrotherapy
—hydrotherapist, n. /huy'dreuh ther"euh pee/, n. 1. the branch of therapeutics that deals with the curative use of water. 2. the treatment of physical disability, injury, or ...
hydrothermal
—hydrothermally, adv. /huy'dreuh therr"meuhl/, adj. Geol. noting or pertaining to the action of hot, aqueous solutions or gases within or on the surface of the earth. [1840-50; ...
hydrothermal mineral deposit
▪ geology       any concentration of metallic minerals formed by the precipitation of solids from hot mineral-laden water (hydrothermal solution). The solutions are ...
hydrothermal ore deposit
Any concentration of metallic minerals formed by the release of solids from hot mineral-laden water (hydrothermal solution). The solutions are thought to arise in most cases ...
hydrothermal vent
Oceanog., Geol. an opening on the floor of the sea from which hot, mineral-rich solutions issue. Cf. vent1 (def. 2). * * *
hydrothermally
See hydrothermal. * * *
hydrothorax
—hydrothoracic /huy'droh theuh ras"ik/, adj. /huy'dreuh thawr"aks, -thohr"-/, n. Pathol. the presence of serous fluid in one or both pleural cavities. [1785-95; HYDRO-1 + ...
hydrotropic
/huy'dreuh trop"ik, -troh"pik/, adj. Biol. turning or tending in a particular direction with reference to moisture. [1915-20; HYDRO-1 + -TROPIC] * * *
hydrotropically
See hydrotropic. * * *
hydrotropism
/huy dro"treuh piz'euhm/, n. Biol. oriented growth in response to water. [1880-85; HYDRO-1 + -TROPISM] * * *
hydrous
/huy"dreuhs/, adj. 1. containing water. 2. Chem. containing water or its elements in some kind of union, as in hydrates or hydroxides. [1820-30; HYDR-1 + -OUS] * * *
hydrous mica
▪ mineral also called  hydromica        any of the illite group of clay minerals, including illite, bramallite (a sodium illite), and glauconite. They are ...
hydroxide
/huy drok"suyd, -sid/, n. a chemical compound containing the hydroxyl group. [1820-30; HYDR-2 + OXIDE] * * * Any compound with one or more functional groups made up of one atom ...
hydroxide ion
the anion OH-. Also called hydroxyl ion. [1950-55] * * *
hydroxideion
hydroxide ion n. The ion OH-, characteristic of basic hydroxides. Also called hydroxyl ion. * * *
hydroxy
hydroxy [hī dräks′ē] adj. containing or related to hydroxyl * * * hy·drox·y (hī-drŏkʹsē) adj. Containing the hydroxyl group.   [From hydroxyl.] * * *
hydroxy acid
1. an organic acid containing both a carboxyl and a hydroxyl group. 2. any of a class of organic acids containing a hydroxyl group and showing properties of both an alcohol and ...
hydroxy-
a combining form used in the names of chemical compounds in which the hydroxyl group is present: hydroxyketone. * * *
hydroxyacetic acid
/huy drok"see euh see"tik, -euh set"ik, -drok'-/. See glycolic acid. [HYDROXY- + ACETIC] * * *
hydroxyapatite
/huy drok'see ap"euh tuyt'/, n. a mineral, Ca10(PO4)6OH2, that is the principal storage form of calcium and phosphorus in bone. [1910-15; HYDROXY- + APATITE] * * *
hydroxybenzene
/huy drok'si ben"zeen, -ben zeen"/, n. phenol (def. 1). [HYDROXY- + BENZENE] * * *
hydroxybutyric acid
/huy drok"see byooh tir"ik, -drok'-/, Biochem. See ketone body. [1875-80; HYDROXY- + BUTYRIC] * * *
hydroxychloroquine
/huy drok'si klawr"euh kween', -kwin, -klohr"-/, n. Pharm. a colorless crystalline solid, C18H26ClN3O, used in the treatment of malaria, lupus erythematosus, and rheumatoid ...
hydroxyketone
/huy drok'si kee"tohn/, n. a ketone containing a hydroxyl group. [HYDROXY- + KETONE] * * *
hydroxyl
—hydroxylic, /huy'drok sil"ik/, adj. /huy drok"seuhl/, adj. containing the hydroxyl group. Also, hydroxy. [1865-70; HYDR-2 + OX(Y)- + -YL] * * *
hydroxyl group
the univalent group -OH, as in inorganic compounds, such as sodium hydroxide, NaOH, or as in organic compounds, such as ethyl alcohol, C2H6O. Also called hydroxyl ...
hydroxyl ion
hydroxyl ion n. HYDROXIDE ION * * *
hydroxyl ion.
See hydroxide ion. * * *
hydroxylamine
/huy drok'seuh leuh meen", -seuhl am"in/, n. an unstable, weakly basic, crystalline compound, NH3O, used as a reducing agent, analytical reagent, and chemical ...
hydroxylapatite
▪ mineral also called  hydroxyapatite        phosphate mineral, calcium hydroxide phosphate [Ca5(PO4)3OH], that forms glassy, often green crystals and masses. It is ...
hydroxylase
/huy drok"seuh lays', -layz'/, n. Biochem. any enzyme that catalyzes the introduction of a hydroxyl group into a substance. [1950-55; HYDROXYL + -ASE] * * *
hydroxylate
hydroxylate [hī dräks′il āt΄] vt. hydroxylated, hydroxylating to introduce the hydroxyl group into (a compound) hydroxylation n. * * * hy·drox·yl·ate ...
hydroxylation
See hydroxylate. * * *
hydroxylic
See hydroxyl. * * *
hydroxylion
hydroxyl ion n. See hydroxide ion. * * *
hydroxylysine
▪ chemical compound       glycogenic amino acid uniquely found in collagen (q.v.), the chief structural protein of mammalian skin and connective tissue, and in some ...
hydroxynaphthalene
/huy drok'si naf"theuh leen', -nap"-/, n. naphthol. [HYDROXY- + NAPHTHALENE] * * *
hydroxyproline
/huy drok"si proh"leen, -lin/, n. Biochem. a nutritionally nonessential amino acid, C5H9NO3, found chiefly in collagen. [1900-05; HYDROXY- + PROLINE] * * * ▪ chemical ...
hydroxyurea
/huy drok'see yoo ree"euh, -yoor"ee euh/, n. Pharm. a synthetic compound, CH4N2O2, used in cancer therapy. [1945-50; HYDROXY- + UREA] * * *
hydroxyzine
/huy drok"seuh zeen'/, n. Pharm. an antihistaminic compound, C21H27ClN2O2, used in the treatment of allergy, nausea, and anxiety. [1955-60; HYDROXY- + (PIPERA)ZINE] * * *
hydrozincite
/huy'droh zing"kuyt/, n. Mineral. a hydrous zinc carbonate, Zn5(CO3)2(OH)6, an important ore of zinc in some localities. [1850-55; < G Hydrozinkit; see HYDRO-, ZINCITE] * * *
hydrozoan
/huy'dreuh zoh"euhn/, n. 1. any freshwater or marine coelenterate of the class Hydrozoa, including free-swimming or attached types, as the hydra, in which one developmental ...
Hydrus
/huy"dreuhs/, n., gen. Hydri /-druy/. Astron. the Water Snake, a southern constellation between Eridanus and Octans. [ < L < Gk hýdros water serpent] * * *
hyena
—hyenic, hyenine /huy ee"nuyn, -nin/, adj. /huy ee"neuh/, n. a doglike carnivore of the family Hyaenidae, of Africa, southwestern Asia, and south central Asia, having a coarse ...
Hyenia
▪ fossil plant genus       genus of herbaceous plants (plant) from the Middle Devonian Epoch (Devonian Period) (about 398 to 385 million years ago). Hyenia grew as a ...
hyenoid
/huy ee"noyd/, adj. resembling a hyena. Also called hyeniform /huy ee"neuh fawrm'/. [1940-45; HYEN(A) + -OID] * * *
Hyères
Hy·ères (ē-ârʹ, yâr) A city of southeast France on the Mediterranean Sea east of Toulon. A medieval port, Hyères is now a resort. The small Hyères Islands lie just off ...
Hyesan
▪ North Korea       city, northern North Korea. As a frontier city lying on the upper stream of the Yalu River (Amnok-kang), it was a fortress during the Yi dynasty ...
hyetal
/huy"i tl/, adj. of or pertaining to rain or rainfall. [1860-65; HYET- + -AL1] * * *
hyeto-
a combining form meaning "rain," used in the formation of compound words: hyetology. Also, esp. before a vowel, hyet-. [comb. form repr. Gk hyetós rain, deriv. of hýein to ...


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