| hydantoin | (noun) any of a group of anticonvulsant drugs used in treating epilepsy | - |
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| hydathode | (noun) a pore that exudes water on the surface or margin of a leaf of higher plants | Synonyms: water pore, water stoma |
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| hydatid | (noun) cyst filled with liquid; forms as a result of infestation by tapeworm larvae (as in echinococcosis) | - |
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| hydatidosis | (noun) infestation with larval echinococci (tapeworms) | Synonyms: echinococcosis, hydatid disease |
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| hydra | (noun) small tubular solitary freshwater hydrozoan polyp | - |
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| (noun) trouble that cannot be overcome by a single effort because of its many aspects or its persistent and pervasive quality | - |
| hydralazine | (noun) an antihypertensive drug (trade name Apresoline) that dilates blood vessels; used (often with a diuretic) to treat hypertension and congestive heart failure | Synonyms: Apresoline |
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| hydramnios | (noun) an abnormality of pregnancy; accumulation of excess amniotic fluid | - |
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| hydrangea | (noun) any of various deciduous or evergreen shrubs of the genus Hydrangea | - |
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| hydrant | (noun) a discharge pipe with a valve and spout at which water may be drawn from the mains of waterworks | - |
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| (noun) a faucet for drawing water from a pipe or cask | Synonyms: tap, water faucet, water tap |
| hydrargyrum | (noun) a heavy silvery toxic univalent and bivalent metallic element; the only metal that is liquid at ordinary temperatures | Synonyms: atomic number 80, Hg, mercury, quicksilver |
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| hydrarthrosis | (noun) inflammation and swelling of a movable joint because of excess synovial fluid | - |
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| hydrate | (noun) any compound that contains water of crystallization | - |
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| (verb) cause to be hydrated; add water or moisture to | - |
| (verb) become hydrated and combine with water | - |
| (verb) supply water or liquid to in order to maintain a healthy balance | - |
| hydrated | (adjective) containing combined water (especially water of crystallization as in a hydrate) | Synonyms: hydrous |
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| hydration | (noun) the process of combining with water; usually reversible | - |
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| hydraulic | (adjective) of or relating to the study of hydraulics | - |
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| (adjective) moved or operated or effected by liquid (water or oil) | - |
| hydraulically | (adverb) in a hydraulic manner | Synonyms: hydraulicly |
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| hydraulicly | (adverb) in a hydraulic manner | Synonyms: hydraulically |
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| hydraulics | (noun) study of the mechanics of fluids | Synonyms: fluid mechanics |
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| hydrazide | (noun) any of a class of organic compounds sharing a common functional group characterized by a nitrogen to nitrogen covalent bond with 4 substituents with at least one of them being an acyl group. | - |
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| hydrazine | (noun) a colorless fuming corrosive liquid; a powerful reducing agent; used chiefly in rocket fuels | - |
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| hydrazoite | (noun) a salt of hydrazoic acid | - |
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| hydremia | (noun) blood disorder in which there is excess fluid volume compared with the cell volume of the blood | - |
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| hydric | (adjective) having or characterized by excessive moisture | - |
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| hydride | (noun) any binary compound formed by the union of hydrogen and other elements | - |
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| hydrilla | (noun) submersed plant with whorled lanceolate leaves and solitary axillary flowers; Old World plant naturalized in southern United States and clogging Florida's waterways | Synonyms: Hydrilla verticillata |
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| hydrocarbon | (noun) an organic compound containing only carbon and hydrogen | - |
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| hydrocele | (noun) disorder in which serous fluid accumulates in a body sac (especially in the scrotum) | - |
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| hydrocephalic | (adjective) relating to or characterized by or evidencing hydrocephalus | - |
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| hydrocephalus | (noun) an abnormal condition in which cerebrospinal fluid collects in the ventricles of the brain; in infants it can cause abnormally rapid growth of the head and bulging fontanelles and a small face; in adults the symptoms are primarily neurological | Synonyms: hydrocephaly |
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| hydrocephaly | (noun) an abnormal condition in which cerebrospinal fluid collects in the ventricles of the brain; in infants it can cause abnormally rapid growth of the head and bulging fontanelles and a small face; in adults the symptoms are primarily neurological | Synonyms: hydrocephalus |
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| hydrochloride | (noun) a complex consisting of an organic base in association with hydrogen chloride | - |
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| hydrochlorofluorocarbon | (noun) a fluorocarbon that is replacing chlorofluorocarbon as a refrigerant and propellant in aerosol cans; considered to be somewhat less destructive to the atmosphere | Synonyms: HCFC |
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| hydrochlorothiazide | (noun) a diuretic drug (trade name Microzide, Esidrix, and HydroDIURIL) used in the treatment of hypertension | Synonyms: Esidrix, HydroDIURIL, Microzide |
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| hydrocolloid | (noun) a substance that forms a gel with water | - |
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| hydrocortisone | (noun) an adrenal-cortex hormone (trade names Hydrocortone or Cortef) that is active in carbohydrate and protein metabolism | Synonyms: Cortef, cortisol, Hydrocortone |
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| hydrocracking | (noun) the process whereby hydrocarbon molecules of petroleum are broken down into kerosene and gasolene by the addition of hydrogen under high pressure in the presence of a catalyst | - |
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| hydrodynamic | (adjective) of or relating to hydrodynamics | - |
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| hydrodynamics | (noun) study of fluids in motion | Synonyms: hydrokinetics |
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| hydroelectric | (adjective) of or relating to or used in the production of electricity by waterpower | - |
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| hydroelectricity | (noun) electricity produced by water power | - |
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| hydroflumethiazide | (noun) diuretic used to treat hypertension and edema | - |
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| hydrofluorocarbon | (noun) a fluorocarbon emitted as a by-product of industrial manufacturing | Synonyms: HFC |
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| hydrofoil | (noun) a speedboat that is equipped with winglike structures that lift it so that it skims the water at high speeds | Synonyms: hydroplane |
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| (noun) a device consisting of a flat or curved piece (as a metal plate) so that its surface reacts to the water it is passing through | Synonyms: foil |
| hydrogel | (noun) a colloidal gel in which water is the dispersion medium | - |
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| hydrogen | (noun) a nonmetallic univalent element that is normally a colorless and odorless highly flammable diatomic gas; the simplest and lightest and most abundant element in the universe | Synonyms: atomic number 1, H |
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| hydrogenate | (verb) combine or treat with or expose to hydrogen; add hydrogen to the molecule of (an unsaturated organic compound) | - |
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| hydrogenation | (noun) a chemical process that adds hydrogen atoms to an unsaturated oil | - |
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| hydrographic | (adjective) of or relating to the science of hydrography | Synonyms: hydrographical |
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| hydrographical | (adjective) of or relating to the science of hydrography | Synonyms: hydrographic |
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| hydrography | (noun) the science of the measurement and description and mapping of the surface waters of the earth with special reference to navigation | - |
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| hydroid | (noun) colonial coelenterates having the polyp phase dominant | Synonyms: hydrozoan |
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| hydroisohypse | (noun) a line on a map connecting points of equal level on the piezometric surface. | - |
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| hydroisopieze | (noun) a line on a map connecting points of identical pressures in the water bearing stratum. | - |
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| hydrokinetic | (adjective) relating to fluids in motion or the forces that produce or affect such motion | - |
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| hydrokinetics | (noun) study of fluids in motion | Synonyms: hydrodynamics |
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| hydrolise | (verb) make a compound react with water and undergo hydrolysis | Synonyms: hydrolize |
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| hydrolith | (noun) a saltlike binary compound (CaH2) used as a reducing agent and source of hydrogen | Synonyms: calcium hydride |
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| hydrolize | (verb) make a compound react with water and undergo hydrolysis | Synonyms: hydrolise |
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| hydrologist | (noun) a geologist skilled in hydrology | - |
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| hydrology | (noun) the branch of geology that studies water on the earth and in the atmosphere: its distribution and uses and conservation | - |
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| hydrolysate | (noun) a product of hydrolysis | - |
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| hydrolyse | (verb) undergo hydrolysis; decompose by reacting with water | Synonyms: hydrolyze |
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| hydrolysis | (noun) a chemical reaction in which water reacts with a compound to produce other compounds; involves the splitting of a bond and the addition of the hydrogen cation and the hydroxide anion from the water | - |
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| hydrolyzable | (adjective) capable of undergoing hydrolysis | - |
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| hydrolyze | (verb) undergo hydrolysis; decompose by reacting with water | Synonyms: hydrolyse |
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| hydromancer | (noun) one who practices hydromancy | - |
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| hydromancy | (noun) divination by water (as by patterns seen in the ebb and flow of the tides) | - |
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| hydromel | (noun) honey diluted in water; becomes mead when fermented | - |
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| hydrometer | (noun) a measuring instrument for determining the specific gravity of a liquid or solid | Synonyms: gravimeter |
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| hydrometric | (adjective) of or relating to hydrometry | Synonyms: gravimetric |
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| hydrometry | (noun) the measurement of specific gravity | Synonyms: gravimetry |
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| hydromorphone | (noun) a narcotic analgesic (trade name Dilaudid) used to treat moderate to severe pain | Synonyms: Dilaudid, hydromorphone hydrochloride |
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| hydronephrosis | (noun) accumulation of urine in the kidney because of an obstruction in the ureter | - |
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| hydropathic | (adjective) of or relating to hydropathy or its administration | - |
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| hydropathy | (noun) the internal and external use of water in the treatment of disease | Synonyms: hydrotherapy |
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| hydrophilic | (adjective) having a strong affinity for water; tending to dissolve in, mix with, or be wetted by water | - |
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| hydrophobia | (noun) an acute viral disease of the nervous system of warm-blooded animals (usually transmitted by the bite of a rabid animal); rabies is fatal if the virus reaches the brain | Synonyms: lyssa, madness, rabies |
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| (noun) a morbid fear of water | - |
| (noun) a symptom of rabies in humans consisting of an aversion to swallowing liquids | - |
| hydrophobic | (adjective) lacking affinity for water; tending to repel and not absorb water; tending not to dissolve in or mix with or be wetted by water | - |
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| (adjective) abnormally afraid of water | Synonyms: aquaphobic |
| hydrophobicity | (noun) the property of being water-repellent; tending to repel and not absorb water | - |
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| hydrophyte | (noun) a plant that grows partly or wholly in water whether rooted in the mud, as a lotus, or floating without anchorage, as the water hyacinth | Synonyms: aquatic plant, hydrophytic plant, water plant |
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| hydrophytic | (adjective) growing wholly or partially in water | - |
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| hydroplane | (noun) an airplane that can land on or take off from water | Synonyms: seaplane |
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| (noun) a speedboat that is equipped with winglike structures that lift it so that it skims the water at high speeds | Synonyms: hydrofoil |
| (verb) glide on the water in a hydroplane | Synonyms: seaplane |
| hydroponic | (adjective) of or relating to aquiculture | Synonyms: aquacultural, aquicultural |
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| hydroponics | (noun) a technique of growing plants (without soil) in water containing dissolved nutrients | Synonyms: aquiculture, tank farming |
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| hydrops | (noun) swelling from excessive accumulation of watery fluid in cells, tissues, or serous cavities | Synonyms: dropsy, edema, oedema |
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| hydrosol | (noun) a sol (colloid) in which the continuous phase is water. | - |
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| hydrosphere | (noun) the watery layer of the earth's surface; includes water vapor | - |
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| hydrostatic | (adjective) relating to fluids at rest or to the pressures they exert or transmit | - |
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| hydrostaticity | (noun) The condition of relating to fluids, especially to the pressure that they exert or transmit. | - |
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| hydrostatics | (noun) study of the mechanical properties of fluids that are not in motion | - |
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| hydrotherapy | (noun) the internal and external use of water in the treatment of disease | Synonyms: hydropathy |
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| hydrothorax | (noun) accumulation of fluid in the pleural cavity (the space between the lungs and the walls of the chest) often resulting from disease of the heart or kidneys | - |
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| hydrous | (adjective) containing combined water (especially water of crystallization as in a hydrate) | Synonyms: hydrated |
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| hydroxide | (noun) a compound of an oxide with water | Synonyms: hydrated oxide |
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| (noun) a chemical compound containing the hydroxyl group | - |
| hydroxy | (adjective) being or containing a hydroxyl group | - |
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| hydroxybenzene | (noun) a toxic white soluble crystalline acidic derivative of benzene; used in manufacturing and as a disinfectant and antiseptic; poisonous if taken internally | Synonyms: carbolic acid, oxybenzene, phenol, phenylic acid |
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| hydroxychloroquine | (noun) anti-inflammatory drug (trade name Plaquenil) used in the treatment of rheumatoid arthritis and malaria and lupus erythematosus | Synonyms: Plaquenil |
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| hydroxyl | (noun) the monovalent group -OH in such compounds as bases and some acids and alcohols | Synonyms: hydroxyl group, hydroxyl radical |
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| hydroxymethyl | (noun) a methyl with hydroxide replacing the hydrogen atoms | - |
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| hydroxyproline | (noun) a crystalline amino acid obtained from gelatin or collagen | - |
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