achlorhydria | (noun) an abnormal deficiency or absence of free hydrochloric acid in the gastric juice; often associated with severe anemias and cancer of the stomach | - |
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anhydride | (noun) a compound formed from one or more other compounds in a reaction resulting in removal of water | - |
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anhydrosis | (noun) failure of the sweat glands | Synonyms: anhidrosis |
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carbohydrate | (noun) an essential structural component of living cells and source of energy for animals; includes simple sugars with small molecules as well as macromolecular substances; are classified according to the number of monosaccharide groups they contain | Synonyms: saccharide, sugar |
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cyanohydrin | (noun) any organic compound in which the cyano radical -CN and the hydroxyl radical -OH are attached to the same carbon atom | - |
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dehydration | (noun) the process of extracting moisture | Synonyms: desiccation, drying up, evaporation |
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(noun) dryness resulting from the removal of water | Synonyms: desiccation |
(noun) depletion of bodily fluids | - |
dehydroretinol | (noun) a viscous alcohol that is less active in mammals than is vitamin A1 | Synonyms: vitamin A2 |
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dihydrostreptomycin | (noun) antibiotic consisting of a hydrogenated form of streptomycin; used against tuberculosis and tularemia and Gram-negative organisms | - |
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dihydroxyphenylalanine | (noun) amino acid that is formed in the liver and converted into dopamine in the brain | Synonyms: dopa |
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dimenhydrinate | (noun) antihistamine and antiemetic (trade name Dramamine) used to treat motion sickness | Synonyms: Dramamine |
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diphenhydramine | (noun) antihistamine (trade name Benadryl) used to treat allergic reactions involving the nasal passages (hay fever) and also to treat motion sickness | Synonyms: Benadryl |
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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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hydration | (noun) the process of combining with water; usually reversible | - |
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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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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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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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hydrodynamics | (noun) study of fluids in motion | Synonyms: hydrokinetics |
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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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hydrogenation | (noun) a chemical process that adds hydrogen atoms to an unsaturated oil | - |
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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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hydrokinetics | (noun) study of fluids in motion | Synonyms: hydrodynamics |
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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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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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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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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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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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hydropathy | (noun) the internal and external use of water in the treatment of disease | Synonyms: hydrotherapy |
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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 | - |
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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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 |
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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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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hydroxide | (noun) a compound of an oxide with water | Synonyms: hydrated oxide |
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(noun) a chemical compound containing the hydroxyl group | - |
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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iodochlorhydroxyquin | (noun) drug used to treat certain fungal infection (as athlete's foot) | Synonyms: Clioquinol |
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magnetohydrodynamics | (noun) the study of the interaction of magnetic fields and electrically conducting fluids (as plasma or molten metal) | - |
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monohydrate | (noun) a hydrate that contains one molecule of water per molecule of the compound | - |
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tetrahydrocannabinol | (noun) psychoactive substance present in marijuana | Synonyms: THC |
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thermohydrometer | (noun) a hydrometer that includes a thermometer | Synonyms: thermogravimeter |
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