Glossary · Nouns · H
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TermTypeDefinitionClassificationsUpdated
Heat ExchangernounMWEdevice that transfers heat from one liquid to another without allowing them to mixverified
Heat ExhaustionnounMWEa condition marked by dizziness and nausea and weakness caused by depletion of body fluids and electrolytesverified
Heat LampnounMWEelectric heater consisting of a high-power incandescent lamp that emits infrared radiationverified
Heat LightningnounMWEbright flashes of light near the horizon without thunder (especially on hot evenings)verified
Heat of CondensationnounMWEheat liberated by a unit mass of gas at its boiling point as it condenses into a liquidverified
Heat of DissociationnounMWEthe heat required for a fluid substance to break up into simpler constituentsverified
Heat of FormationnounMWEthe heat evolved or absorbed during the formation of one mole of a substance from its component elementsverified
Heat of FusionnounMWEheat absorbed by a unit mass of a solid at its melting point in order to convert the solid into a liquid at the same temperatureverified
Heat of SolidificationnounMWEheat liberated by a unit mass of liquid at its freezing point when it solidifiesverified
Heat of SolutionnounMWEthe heat evolved or absorbed when one mole of a substance is dissolved in a large volume of a solventverified
Heat of SublimationnounMWEheat absorbed by a unit mass of material when it changes from a solid to a gaseous stateverified
Heat of TransformationnounMWEheat absorbed or radiated during a change of phase at a constant temperature and pressureverified
Heat of VaporisationnounMWEheat absorbed by a unit mass of a material at its boiling point in order to convert the material into a gas at the same temperatureverified
Heat of VaporizationnounMWEheat absorbed by a unit mass of a material at its boiling point in order to convert the material into a gas at the same temperatureverified
Heat ProstrationnounMWEa condition marked by dizziness and nausea and weakness caused by depletion of body fluids and electrolytesverified
Heat PumpnounMWEapparatus that extracts heat from a liquid that is at a higher temperature than its surroundingsverified
Heat ShieldnounMWEa protective covering that protects a spacecraft from overheating on reentryverified
Heat-Seeking MissilenounMWEa missile with a guidance system that directs it toward targets emitting infrared radiation (as the emissions of a jet engine)verified
Heath AsternounMWEcommon much-branched North American perennial with heathlike foliage and small starry white flowersverified
Heath PeanounMWEEuropean herb bearing small tubers used for food and in Scotland to flavor whiskeyverified
Heathernouninterwoven yarns of mixed colors producing muted greyish shades with flecks of colorverified
Heather MixturenounMWEinterwoven yarns of mixed colors producing muted greyish shades with flecks of colorverified
Heating ElementnounMWEthe component of a heater or range that transforms fuel or electricity into heatverified
Heating PadnounMWEheater consisting of electrical heating elements contained in a flexible padverified
Heavensnounthe apparent surface of the imaginary sphere on which celestial bodies appear to be projectedverified
Heavier-Than-Air CraftnounMWEa non-buoyant aircraft that requires a source of power to hold it aloft and to propel itverified
Heavy HitternounMWEan influential person who works hard to promote the causes they are interested inverified
Heavy HydrogennounMWEan isotope of hydrogen which has one neutron (as opposed to zero neutrons in hydrogen)verified
Heavy MetalnounMWEa metal of relatively high density, i.e. specific gravity greater than about 5, or of high relative atomic weight – especially one that is poisonous like mercury or leadverified
Heavy ParticlenounMWEany of the elementary particles having a mass equal to or greater than that of a proton and that participate in strong interactionsverified
Heavy WaternounMWEwater containing a substantial proportion of deuterium atoms, used in nuclear reactorsverified
Hebephrenianouna form of schizophrenia characterized by severe disintegration of personality including erratic speech and childish mannerisms and bizarre behaviorverified
Hebephrenic SchizophrenianounMWEa form of schizophrenia characterized by severe disintegration of personality including erratic speech and childish mannerisms and bizarre behaviorverified
Hectarenoun(abbreviated `ha') a unit of surface area equal to 100 ares (or 10,000 square meters)verified
Hedge FundnounMWEa flexible investment company for a small number of large investors (usually the minimum investment is $1 million)verified
Hedge NettlenounMWEperennial herb with an odorless rhizome widespread in moist places in northern hemisphereverified
Hedge PinknounMWEplant of European origin having pink or white flowers and leaves yielding a detergent when bruisedverified
Hedgernounsomeone who counterbalances one transaction (as a bet) against another in order to protect against lossverified
Hediondillanoundesert shrub of southwestern United States and New Mexico having persistent resinous aromatic foliage and small yellow flowersverified