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301 Nouns That Start With HY

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