Glossary · Nouns · H
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TermTypeDefinitionClassificationsUpdated
Hydrographynounthe science of the measurement and description and mapping of the surface waters of the earth with special reference to navigationverified
Hydrolithnouna saltlike binary compound (CaH2) used as a reducing agent and source of hydrogenverified
Hydrologynounthe branch of geology that studies water on the earth and in the atmosphere: its distribution and uses and conservationverified
Hydrolysisnouna chemical reaction in which water reacts with a compound to produce other compoundsverified
Hydrometernouna measuring instrument for determining the specific gravity of a liquid or solidverified
Hydromorphonenouna narcotic analgesic (trade name Dilaudid) used to treat moderate to severe painverified
Hydromorphone HydrochloridenounMWEa narcotic analgesic (trade name Dilaudid) used to treat moderate to severe painverified
Hydronephrosisnounaccumulation of urine in the kidney because of an obstruction in the ureterverified
Hydrophobianounan acute viral disease of the nervous system of warm-blooded animals (usually transmitted by the bite of a rabid animal)verified
Hydrophytenouna plant that grows partly or wholly in water whether rooted in the mud, as a lotus, or floating without anchorage, as the water hyacinthverified
Hydrophytic PlantnounMWEa plant that grows partly or wholly in water whether rooted in the mud, as a lotus, or floating without anchorage, as the water hyacinthverified
Hydroponicsnouna technique of growing plants (without soil) in water containing dissolved nutrientsverified
Hydropsnounswelling from excessive accumulation of watery fluid in cells, tissues, or serous cavitiesverified
Hydrostatic HeadnounMWEthe pressure at a given point in a liquid measured in terms of the vertical height of a column of the liquid needed to produce the same pressureverified
Hydrothoraxnounaccumulation 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 kidneysverified
Hydroxy AcidnounMWEany acid that has hydroxyl groups in addition to the hydroxyl group in the acid itselfverified
Hydroxyacetic AcidnounMWEa translucent crystalline compound found in sugar cane and sugar beets and unripe grapesverified
Hydroxychloroquinenounanti-inflammatory drug (trade name Plaquenil) used in the treatment of rheumatoid arthritis and malaria and lupus erythematosusverified
Hydroxyl GroupnounMWEthe monovalent group -OH in such compounds as bases and some acids and alcoholsverified
Hydroxyl RadicalnounMWEthe monovalent group -OH in such compounds as bases and some acids and alcoholsverified
Hydroxytetracyclinenouna yellow crystalline antibiotic (trademark Terramycin) obtained from a soil actinomyceteverified
Hydroxyzinenouna drug (trade names Atarax and Vistaril) used as a tranquilizer to treat anxiety and motion sicknessverified
Hydroxyzine HydrochloridenounMWEa drug (trade names Atarax and Vistaril) used as a tranquilizer to treat anxiety and motion sicknessverified
Hyena DognounMWEa powerful doglike mammal of southern and eastern Africa that hunts in large packsverified
Hymenopternouninsects having two pairs of membranous wings and an ovipositor specialized for stinging or piercingverified
Hymenopterannouninsects having two pairs of membranous wings and an ovipositor specialized for stinging or piercingverified
Hymenopteronnouninsects having two pairs of membranous wings and an ovipositor specialized for stinging or piercingverified
Hymenopterous InsectnounMWEinsects having two pairs of membranous wings and an ovipositor specialized for stinging or piercingverified
Hyoscinenounan alkaloid with anticholinergic effects that is used as a sedative and to treat nausea and to dilate the pupils in ophthalmic proceduresverified
Hypanthiumnounthe cuplike or ringlike or tubular structure of a flower which bears the sepals and stamens and calyx (as in Rosaceae)verified
Hyperacusianounabnormal acuteness of hearing due to increased irritability of the sensory neural mechanismverified
Hyperacusisnounabnormal acuteness of hearing due to increased irritability of the sensory neural mechanismverified
Hyperadrenalismnouna glandular disorder caused by excessive ACTH resulting in greater than normal functioning of the adrenal glandverified
Hyperalimentationnounadministration of a nutritionally adequate solution through a catheter into the vena cavaverified
Hyperbaric ChambernounMWEa large chamber in which the oxygen pressure is above normal for the atmosphereverified
Hyperbilirubinemia of the NewbornnounMWEa common disorder that is usually due to immaturity of the liververified
Hyperbolic GeometrynounMWEin mathematics, a non-Euclidean geometry in which the parallel axiom is replaced by the assumption that through any point in a plane there are two or more lines that do not intersect a given line in the planeverified
Hypercapnianounthe physical condition of having the presence of an abnormally high level of carbon dioxide in the circulating bloodverified
Hypercarbianounthe physical condition of having the presence of an abnormally high level of carbon dioxide in the circulating bloodverified
Hypercholesteremianounthe presence of an abnormal amount of cholesterol in the cells and plasma of the bloodverified