| 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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| hydroxytetracycline | (noun) a yellow crystalline antibiotic (trademark Terramycin) obtained from a soil actinomycete; used to treat various bacterial and rickettsial infections | Synonyms: oxytetracycline, oxytetracycline hydrochloride, Terramycin |
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| hydroxyzine | (noun) a drug (trade names Atarax and Vistaril) used as a tranquilizer to treat anxiety and motion sickness | Synonyms: Atarax, hydroxyzine hydrochloride, Vistaril |
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| hydrozoan | (noun) colonial coelenterates having the polyp phase dominant | Synonyms: hydroid |
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| hyena | (noun) doglike nocturnal mammal of Africa and southern Asia that feeds chiefly on carrion | Synonyms: hyaena |
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| hygiene | (noun) the science concerned with the prevention of illness and maintenance of health | Synonyms: hygienics |
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| (noun) a condition promoting sanitary practices | - |
| hygienic | (adjective) tending to promote or preserve health | Synonyms: hygienical |
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| hygienical | (adjective) tending to promote or preserve health | Synonyms: hygienic |
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| hygienically | (adverb) in a hygienic manner | - |
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| hygienics | (noun) the science concerned with the prevention of illness and maintenance of health | Synonyms: hygiene |
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| hygienise | (verb) make sanitary by cleaning or sterilizing | Synonyms: hygienize, sanitise, sanitize |
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| hygienist | (noun) a medical specialist in hygiene | - |
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| hygienize | (verb) make sanitary by cleaning or sterilizing | Synonyms: hygienise, sanitise, sanitize |
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| hygrodeik | (noun) a wet and dry bulb hygrometer | - |
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| hygrometer | (noun) measuring instrument for measuring the relative humidity of the atmosphere | - |
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| hygrophyte | (noun) a plant that grows in a moist habitat | - |
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| hygrophytic | (adjective) requiring an abundance of moisture | - |
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| hygroscope | (noun) hygrometer that shows variations in the relative humidity of the atmosphere | - |
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| hygroscopic | (adjective) absorbing moisture (as from the air) | - |
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| hymen | (noun) a fold of tissue that partly covers the entrance to the vagina of a virgin | Synonyms: maidenhead, virginal membrane |
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| hymenal | (adjective) of or relating to the hymen | - |
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| hymeneal | (adjective) of or relating to a wedding or marriage | - |
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| (noun) a wedding hymn | - |
| hymeneals | (noun) the social event at which the ceremony of marriage is performed | Synonyms: nuptials, wedding, wedding ceremony |
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| hymenium | (noun) spore-bearing layer of cells in certain fungi containing asci or basidia | - |
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| hymenopter | (noun) insects having two pairs of membranous wings and an ovipositor specialized for stinging or piercing | Synonyms: hymenopteran, hymenopteron, hymenopterous insect |
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| hymenopteran | (noun) insects having two pairs of membranous wings and an ovipositor specialized for stinging or piercing | Synonyms: hymenopter, hymenopteron, hymenopterous insect |
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| hymenopteron | (noun) insects having two pairs of membranous wings and an ovipositor specialized for stinging or piercing | Synonyms: hymenopter, hymenopteran, hymenopterous insect |
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| hymenopterous | (adjective) of or relating to insects of the order Hymenoptera | - |
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| hymie | (noun) (ethnic slur) offensive term for a Jew | Synonyms: kike, sheeny, yid |
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| hymn | (noun) a song of praise (to God or to a saint or to a nation) | Synonyms: anthem |
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| (verb) praise by singing a hymn | - |
| (verb) sing a hymn | - |
| hymnal | (noun) a songbook containing a collection of hymns | Synonyms: hymnary, hymnbook |
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| hymnary | (noun) a songbook containing a collection of hymns | Synonyms: hymnal, hymnbook |
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| hymnbook | (noun) a songbook containing a collection of hymns | Synonyms: hymnal, hymnary |
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| hymnody | (noun) the act of singing psalms or hymns | Synonyms: psalmody |
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| hymnography | (noun) (music) the craft of hymn composition. | - |
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| hyoid | (adjective) of or relating to the hyoid bone | - |
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| (noun) a U-shaped bone at the base of the tongue that supports the tongue muscles | Synonyms: hyoid bone, os hyoideum |
| hyoscine | (noun) an alkaloid with anticholinergic effects that is used as a sedative and to treat nausea and to dilate the pupils in ophthalmic procedures | Synonyms: scopolamine |
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| hyoscyamine | (noun) a poisonous crystalline alkaloid (isometric with atropine but more potent); used to treat excess motility of the gastrointestinal tract | - |
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| hypaethral | (adjective) partly or entirely open to the sky | Synonyms: hypethral |
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| hypallage | (noun) reversal of the syntactic relation of two words (as in `her beauty's face') | - |
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| hypanthium | (noun) the cuplike or ringlike or tubular structure of a flower which bears the sepals and stamens and calyx (as in Rosaceae) | Synonyms: calyx tube, floral cup |
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| hype | (noun) blatant or sensational promotion | Synonyms: ballyhoo, hoopla, plug |
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| (verb) publicize in an exaggerated and often misleading manner | - |
| hyperacidity | (noun) excessive acidity | - |
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| hyperactive | (adjective) more active than normal | Synonyms: overactive |
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| hyperactivity | (noun) a condition characterized by excessive restlessness and movement | - |
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| hyperacusia | (noun) abnormal acuteness of hearing due to increased irritability of the sensory neural mechanism; characterized by intolerance for ordinary sound levels | Synonyms: auditory hyperesthesia, hyperacusis |
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| hyperacusis | (noun) abnormal acuteness of hearing due to increased irritability of the sensory neural mechanism; characterized by intolerance for ordinary sound levels | Synonyms: auditory hyperesthesia, hyperacusia |
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| hyperadrenalism | (noun) a glandular disorder caused by excessive ACTH resulting in greater than normal functioning of the adrenal gland; characterized by obesity | Synonyms: Cushing's disease |
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| hyperadrenocorticism | (noun) a glandular disorder caused by excessive cortisol | Synonyms: Cushing's syndrome |
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| hyperaemia | (noun) increased blood in an organ or other body part | Synonyms: hyperemia |
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| hyperaldosteronism | (noun) a condition caused by overproduction of aldosterone | Synonyms: aldosteronism |
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| hyperalimentation | (noun) administration of a nutritionally adequate solution through a catheter into the vena cava; used in cases of long-term coma or severe burns or severe gastrointestinal syndromes | Synonyms: total parenteral nutrition, TPN |
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| hyperbaton | (noun) reversal of normal word order (as in `cheese I love') | - |
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| hyperbetalipoproteinemia | (noun) a genetic disorder characterized by high levels of beta-lipoproteins and cholesterol; can lead to atherosclerosis at an early age | - |
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| hyperbilirubinemia | (noun) abnormally high amounts of bile pigment (bilirubin) in the blood | - |
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| hyperbola | (noun) an open curve formed by a plane that cuts the base of a right circular cone | - |
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| hyperbole | (noun) extravagant exaggeration | Synonyms: exaggeration |
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| hyperbolic | (adjective) of or relating to a hyperbola | - |
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| (adjective) enlarged beyond truth or reasonableness | Synonyms: inflated |
| hyperbolically | (adverb) in an exaggerated manner | Synonyms: exaggeratedly |
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| hyperbolise | (verb) to enlarge beyond bounds or the truth | Synonyms: amplify, exaggerate, hyperbolize, magnify, overdraw, overstate |
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| hyperbolism | (noun) the use of hyperbole. | - |
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| hyperbolize | (verb) to enlarge beyond bounds or the truth | Synonyms: amplify, exaggerate, hyperbolise, magnify, overdraw, overstate |
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| hyperboloid | (noun) a quadric surface generated by rotating a hyperbola around its main axis | - |
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| hyperboloidal | (adjective) having the shape of a hyperboloid | - |
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| hypercalcaemia | (noun) the presence of abnormally high levels of calcium in the blood; usually the result of excessive bone resorption in hyperparathyroidism or Paget's disease | Synonyms: hypercalcemia |
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| hypercalcemia | (noun) the presence of abnormally high levels of calcium in the blood; usually the result of excessive bone resorption in hyperparathyroidism or Paget's disease | Synonyms: hypercalcaemia |
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| hypercalcinuria | (noun) the presence of abnormally high levels of calcium in the urine; usually the result of excessive bone resorption in hyperparathyroidism or osteoporosis | Synonyms: hypercalciuria |
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| hypercalciuria | (noun) the presence of abnormally high levels of calcium in the urine; usually the result of excessive bone resorption in hyperparathyroidism or osteoporosis | Synonyms: hypercalcinuria |
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| hypercapnia | (noun) the physical condition of having the presence of an abnormally high level of carbon dioxide in the circulating blood | Synonyms: hypercarbia |
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| hypercarbia | (noun) the physical condition of having the presence of an abnormally high level of carbon dioxide in the circulating blood | Synonyms: hypercapnia |
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| hypercatalectic | (adjective) (verse) having an extra syllable or syllables at the end of a metrically complete verse or in a metrical foot | - |
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| (noun) (prosody) a line of poetry having an extra syllable or syllables at the end of the last metrical foot | - |
| hypercellularity | (noun) the state of having abnormally many cells | - |
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| hypercholesteremia | (noun) the presence of an abnormal amount of cholesterol in the cells and plasma of the blood; associated with the risk of atherosclerosis | Synonyms: hypercholesterolemia |
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| hypercholesterolemia | (noun) the presence of an abnormal amount of cholesterol in the cells and plasma of the blood; associated with the risk of atherosclerosis | Synonyms: hypercholesteremia |
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| hypercoaster | (noun) a roller coaster that goes up 200 feet or higher and can catapult riders from 0 to 70 mph in 4 seconds by motors originally designed to launch rockets | - |
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| hypercritical | (adjective) inclined to judge too severely | Synonyms: overcritical |
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| hypercriticism | (noun) Excessive or unfairly harsh criticism. | - |
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| hyperdactyly | (noun) birth defect characterized by the presence of more than the normal number of fingers or toes | Synonyms: polydactyly |
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| hyperemesis | (noun) severe and excessive vomiting | - |
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| hyperemia | (noun) increased blood in an organ or other body part | Synonyms: hyperaemia |
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| hyperemic | (adjective) relating to or caused by hyperemia | - |
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| hyperextend | (verb) extend a joint beyond its normal range | - |
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| hyperextension | (noun) greater than normal extension | - |
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| hyperfine | (adjective) extremely fine or thin, as in a spectral line split into two or more components | - |
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