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301 Nouns That Start With HY

Word Definitions Synonyms
hyacinth a red transparent variety of zircon used as a gemstone jacinth
hyacinth any of numerous bulbous perennial herbs -
hyaena doglike nocturnal mammal of Africa and southern Asia that feeds chiefly on carrion hyena
hyalin a glassy translucent substance that occurs in hyaline cartilage or in certain skin conditions hyaline
hyaline a glassy translucent substance that occurs in hyaline cartilage or in certain skin conditions hyalin
hyalinisation the state of being hyaline or having become hyaline hyalinization
hyalinization the state of being hyaline or having become hyaline hyalinisation
hyaloid the transparent membrane enveloping the vitreous humor of the eye and separating it from the retina hyaloid membrane
hyaloplasm the clear nongranular portion of the cytoplasm of a cell ground substance
hyaluronidase an enzyme (trade name Hyazyme) that splits hyaluronic acid and so lowers its viscosity and increases the permeability of connective tissue and the absorption of fluids Hyazyme, spreading factor
hybrid a word that is composed of parts from different languages (e.g., `monolingual' has a Greek prefix and a Latin root) loan-blend, loanblend
hybrid a composite of mixed origin -
hybrid (genetics) an organism that is the offspring of genetically dissimilar parents or stock; especially offspring produced by breeding plants or animals of different varieties or breeds or species cross, crossbreed
hybrid a car which runs on two power sources, usually an internal combustion engine and an electronic motor hybrid car
hybridisation (genetics) the act of mixing different species or varieties of animals or plants and thus to produce hybrids crossing, interbreeding, hybridization, hybridizing, cross, crossbreeding
hybridization (genetics) the act of mixing different species or varieties of animals or plants and thus to produce hybrids crossing, interbreeding, hybridisation, hybridizing, cross, crossbreeding
hybridizing (genetics) the act of mixing different species or varieties of animals or plants and thus to produce hybrids crossing, interbreeding, hybridisation, hybridization, cross, crossbreeding
hybridoma a hybrid cell resulting from the fusion of a lymphocyte and a tumor cell; used to culture a specific monoclonal antibody -
hydantoin any of a group of anticonvulsant drugs used in treating epilepsy -
hydathode a pore that exudes water on the surface or margin of a leaf of higher plants water pore, water stoma
hydatid cyst filled with liquid; forms as a result of infestation by tapeworm larvae (as in echinococcosis) -
hydatidosis infestation with larval echinococci (tapeworms) hydatid disease, echinococcosis
hydra trouble that cannot be overcome by a single effort because of its many aspects or its persistent and pervasive quality -
hydra small tubular solitary freshwater hydrozoan polyp -
hydralazine an antihypertensive drug (trade name Apresoline) that dilates blood vessels; used (often with a diuretic) to treat hypertension and congestive heart failure Apresoline
hydramnios an abnormality of pregnancy; accumulation of excess amniotic fluid -
hydrangea any of various deciduous or evergreen shrubs of the genus Hydrangea -
hydrant a faucet for drawing water from a pipe or cask tap, water faucet, water tap
hydrant a discharge pipe with a valve and spout at which water may be drawn from the mains of waterworks -
hydrargyrum a heavy silvery toxic univalent and bivalent metallic element; the only metal that is liquid at ordinary temperatures Hg, mercury, quicksilver, atomic number 80
hydrarthrosis inflammation and swelling of a movable joint because of excess synovial fluid -
hydrate any compound that contains water of crystallization -
hydration the process of combining with water; usually reversible -
hydraulics study of the mechanics of fluids fluid mechanics
hydrazide 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. -
hydrazine a colorless fuming corrosive liquid; a powerful reducing agent; used chiefly in rocket fuels -
hydrazoite a salt of hydrazoic acid -
hydremia blood disorder in which there is excess fluid volume compared with the cell volume of the blood -
hydride any binary compound formed by the union of hydrogen and other elements -
hydrilla submersed plant with whorled lanceolate leaves and solitary axillary flowers; Old World plant naturalized in southern United States and clogging Florida's waterways Hydrilla verticillata
hydrocarbon an organic compound containing only carbon and hydrogen -
hydrocele disorder in which serous fluid accumulates in a body sac (especially in the scrotum) -
hydrocephalus 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 hydrocephaly
hydrocephaly 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 hydrocephalus
hydrochloride a complex consisting of an organic base in association with hydrogen chloride -
hydrochlorofluorocarbon a fluorocarbon that is replacing chlorofluorocarbon as a refrigerant and propellant in aerosol cans; considered to be somewhat less destructive to the atmosphere HCFC
hydrochlorothiazide a diuretic drug (trade name Microzide, Esidrix, and HydroDIURIL) used in the treatment of hypertension HydroDIURIL, Microzide, Esidrix
hydrocolloid a substance that forms a gel with water -
hydrocortisone an adrenal-cortex hormone (trade names Hydrocortone or Cortef) that is active in carbohydrate and protein metabolism Hydrocortone, Cortef, cortisol
hydrocracking 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 -
hydrodynamics study of fluids in motion hydrokinetics
hydroelectricity electricity produced by water power -
hydroflumethiazide diuretic used to treat hypertension and edema -
hydrofluorocarbon a fluorocarbon emitted as a by-product of industrial manufacturing HFC
hydrofoil 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 foil
hydrofoil a speedboat that is equipped with winglike structures that lift it so that it skims the water at high speeds hydroplane
hydrogel a colloidal gel in which water is the dispersion medium -
hydrogen 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 H, atomic number 1
hydrogenation a chemical process that adds hydrogen atoms to an unsaturated oil -
hydrography the science of the measurement and description and mapping of the surface waters of the earth with special reference to navigation -
hydroid colonial coelenterates having the polyp phase dominant hydrozoan
hydroisohypse a line on a map connecting points of equal level on the piezometric surface. -
hydroisopieze a line on a map connecting points of identical pressures in the water bearing stratum. -
hydrokinetics study of fluids in motion hydrodynamics
hydrolith a saltlike binary compound (CaH2) used as a reducing agent and source of hydrogen calcium hydride
hydrologist a geologist skilled in hydrology -
hydrology the branch of geology that studies water on the earth and in the atmosphere: its distribution and uses and conservation -
hydrolysate a product of hydrolysis -
hydrolysis 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 -
hydromancer one who practices hydromancy -
hydromancy divination by water (as by patterns seen in the ebb and flow of the tides) -
hydromel honey diluted in water; becomes mead when fermented -
hydrometer a measuring instrument for determining the specific gravity of a liquid or solid gravimeter
hydrometry the measurement of specific gravity gravimetry
hydromorphone a narcotic analgesic (trade name Dilaudid) used to treat moderate to severe pain hydromorphone hydrochloride, Dilaudid
hydronephrosis accumulation of urine in the kidney because of an obstruction in the ureter -
hydropathy the internal and external use of water in the treatment of disease hydrotherapy
hydrophobia a symptom of rabies in humans consisting of an aversion to swallowing liquids -
hydrophobia a morbid fear of water -
hydrophobia 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 madness, rabies, lyssa
hydrophobicity the property of being water-repellent; tending to repel and not absorb water -
hydrophyte 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 hydrophytic plant, water plant, aquatic plant
hydroplane an airplane that can land on or take off from water seaplane
hydroplane a speedboat that is equipped with winglike structures that lift it so that it skims the water at high speeds hydrofoil
hydroponics a technique of growing plants (without soil) in water containing dissolved nutrients aquiculture, tank farming
hydrops swelling from excessive accumulation of watery fluid in cells, tissues, or serous cavities dropsy, oedema, edema
hydrosol a sol (colloid) in which the continuous phase is water. -
hydrosphere the watery layer of the earth's surface; includes water vapor -
hydrostaticity The condition of relating to fluids, especially to the pressure that they exert or transmit. -
hydrostatics study of the mechanical properties of fluids that are not in motion -
hydrotherapy the internal and external use of water in the treatment of disease hydropathy
hydrothorax 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 -
hydroxide a compound of an oxide with water hydrated oxide
hydroxide a chemical compound containing the hydroxyl group -
hydroxybenzene a toxic white soluble crystalline acidic derivative of benzene; used in manufacturing and as a disinfectant and antiseptic; poisonous if taken internally phenol, phenylic acid, oxybenzene, carbolic acid
hydroxychloroquine anti-inflammatory drug (trade name Plaquenil) used in the treatment of rheumatoid arthritis and malaria and lupus erythematosus Plaquenil
hydroxyl the monovalent group -OH in such compounds as bases and some acids and alcohols hydroxyl group, hydroxyl radical
hydroxymethyl a methyl with hydroxide replacing the hydrogen atoms -
hydroxyproline a crystalline amino acid obtained from gelatin or collagen -
hydroxytetracycline a yellow crystalline antibiotic (trademark Terramycin) obtained from a soil actinomycete; used to treat various bacterial and rickettsial infections oxytetracycline, oxytetracycline hydrochloride, Terramycin
hydroxyzine a drug (trade names Atarax and Vistaril) used as a tranquilizer to treat anxiety and motion sickness hydroxyzine hydrochloride, Vistaril, Atarax
hydrozoan colonial coelenterates having the polyp phase dominant hydroid
hyena doglike nocturnal mammal of Africa and southern Asia that feeds chiefly on carrion hyaena
hygiene a condition promoting sanitary practices -
hygiene the science concerned with the prevention of illness and maintenance of health hygienics
hygienics the science concerned with the prevention of illness and maintenance of health hygiene
hygienist a medical specialist in hygiene -
hygrodeik a wet and dry bulb hygrometer -
hygrometer measuring instrument for measuring the relative humidity of the atmosphere -
hygrophyte a plant that grows in a moist habitat -
hygroscope hygrometer that shows variations in the relative humidity of the atmosphere -
hymen a fold of tissue that partly covers the entrance to the vagina of a virgin maidenhead, virginal membrane