| hermetic | (adjective) completely sealed; completely airtight | - |
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| hermetically | (adverb) in an airtight manner | - |
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| hermit | (noun) one who lives in solitude | Synonyms: recluse, solitary, solitudinarian, troglodyte |
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| (noun) one retired from society for religious reasons | Synonyms: anchorite |
| hermitage | (noun) the abode of a hermit | - |
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| hermitic | (adjective) characterized by ascetic solitude | Synonyms: anchoritic, eremitic, eremitical, hermitical |
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| hermitical | (adjective) characterized by ascetic solitude | Synonyms: anchoritic, eremitic, eremitical, hermitic |
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| hernia | (noun) rupture in smooth muscle tissue through which a bodily structure protrudes | Synonyms: herniation |
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| herniation | (noun) rupture in smooth muscle tissue through which a bodily structure protrudes | Synonyms: hernia |
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| hero | (noun) the principal character in a play or movie or novel or poem | - |
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| (noun) a large sandwich made of a long crusty roll split lengthwise and filled with meats and cheese (and tomato and onion and lettuce and condiments); different names are used in different sections of the United States | Synonyms: bomber, Cuban sandwich, grinder, hero sandwich, hoagie, hoagy, Italian sandwich, poor boy, sub, submarine, submarine sandwich, torpedo, wedge, zep |
| (noun) a person distinguished by exceptional courage and nobility and strength | - |
| (noun) someone who fights for a cause | Synonyms: champion, fighter, paladin |
| (noun) (classical mythology) a being of great strength and courage celebrated for bold exploits; often the offspring of a mortal and a god | - |
| heroic | (adjective) relating to or characteristic of heroes of antiquity | - |
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| (adjective) having or displaying qualities appropriate for heroes | Synonyms: heroical |
| (adjective) showing extreme courage; especially of actions courageously undertaken in desperation as a last resort | Synonyms: desperate |
| (adjective) of behavior that is impressive and ambitious in scale or scope | Synonyms: expansive, grand |
| (adjective) very imposing or impressive; surpassing the ordinary (especially in size or scale) | Synonyms: epic, larger-than-life |
| (noun) a verse form suited to the treatment of heroic or elevated themes; dactylic hexameter or iambic pentameter | Synonyms: heroic meter, heroic verse |
| heroical | (adjective) having or displaying qualities appropriate for heroes | Synonyms: heroic |
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| heroically | (adverb) in a heroic manner | - |
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| heroics | (noun) ostentatious or vainglorious or extravagant or melodramatic conduct | - |
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| heroin | (noun) a narcotic that is considered a hard drug; a highly addictive morphine derivative; intravenous injection provides the fastest and most intense rush | Synonyms: diacetylmorphine |
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| heroine | (noun) a woman possessing heroic qualities or a woman who has performed heroic deeds | - |
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| (noun) the main good female character in a work of fiction | - |
| heroism | (noun) the qualities of a hero or heroine; exceptional or heroic courage when facing danger (especially in battle) | Synonyms: gallantry, valiance, valiancy, valor, valorousness, valour |
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| heroization | (noun) the act, or the result, of making someone into a hero. | - |
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| heron | (noun) grey or white wading bird with long neck and long legs and (usually) long bill | - |
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| heronry | (noun) a breeding ground for herons; a heron rookery | - |
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| herpangia | (noun) a viral infection (usually in children) marked by sore throat and fever and papules in the mouth and throat and headache and abdominal pain; usually subsides in a short time | - |
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| herpes | (noun) any of the animal viruses that cause painful blisters on the skin | Synonyms: herpes virus |
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| (noun) viral diseases causing eruptions of the skin or mucous membrane | - |
| herpetologist | (noun) a zoologist who studies reptiles and amphibians | - |
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| herpetology | (noun) the branch of zoology concerned with reptiles and amphibians | - |
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| herrerasaur | (noun) a kind of theropod dinosaur found in Argentina | Synonyms: herrerasaurus |
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| herrerasaurus | (noun) a kind of theropod dinosaur found in Argentina | Synonyms: herrerasaur |
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| herring | (noun) commercially important food fish of northern waters of both Atlantic and Pacific | Synonyms: Clupea harangus |
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| (noun) valuable flesh of fatty fish from shallow waters of northern Atlantic or Pacific; usually salted or pickled | - |
| herringbone | (noun) a twilled fabric with a herringbone pattern | - |
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| (noun) a pattern of columns of short parallel lines with all the lines in one column sloping one way and lines in adjacent columns sloping the other way; it is used in weaving, masonry, parquetry, embroidery | Synonyms: herringbone pattern |
| hertz | (noun) the unit of frequency; one hertz has a periodic interval of one second (named for Heinrich Rudolph Hertz) | Synonyms: cps, cycle, cycle per second, cycles/second, Hz |
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| heterothermic | (adjective) of animals except birds and mammals; having body temperature that varies with the environment | Synonyms: ectothermic, poikilothermic, poikilothermous |
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| higher | (adjective) of education beyond the secondary level | - |
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| (adjective) advanced in complexity or elaboration | - |
| historiographer | (noun) a person who is an authority on history and who studies it and writes about it | Synonyms: historian |
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| hither | (adverb) to this place (especially toward the speaker) | Synonyms: here |
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| hitherto | (adverb) used in negative statement to describe a situation that has existed up to this point or up to the present time | Synonyms: as yet, heretofore, so far, thus far, til now, until now, up to now, yet |
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| homeotherm | (noun) an animal that has a body temperature that is relatively constant and independent of the environmental temperature | Synonyms: homoiotherm, homotherm |
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| homeothermic | (adjective) of birds and mammals; having constant and relatively high body temperature | Synonyms: homoiothermic, homothermic |
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| homoiotherm | (noun) an animal that has a body temperature that is relatively constant and independent of the environmental temperature | Synonyms: homeotherm, homotherm |
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| homoiothermic | (adjective) of birds and mammals; having constant and relatively high body temperature | Synonyms: homeothermic, homothermic |
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| homotherm | (noun) an animal that has a body temperature that is relatively constant and independent of the environmental temperature | Synonyms: homeotherm, homoiotherm |
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| homothermic | (adjective) of birds and mammals; having constant and relatively high body temperature | Synonyms: homeothermic, homoiothermic |
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| houhere | (noun) small tree or shrub of New Zealand having a profusion of axillary clusters of honey-scented paper-white flowers and whose bark is used for cordage | Synonyms: Hoheria populnea, lacebark, ribbonwood |
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| housefather | (noun) a man in charge of children in an institution | - |
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| housemother | (noun) a woman employed as a chaperon in a residence for young people | - |
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| hydrosphere | (noun) the watery layer of the earth's surface; includes water vapor | - |
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| hydrotherapy | (noun) the internal and external use of water in the treatment of disease | Synonyms: hydropathy |
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| hyperthermal | (adjective) of or relating to or affected by hyperthermia | - |
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| hyperthermia | (noun) abnormally high body temperature; sometimes induced (as in treating some forms of cancer) | Synonyms: hyperthermy |
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| hyperthermy | (noun) abnormally high body temperature; sometimes induced (as in treating some forms of cancer) | Synonyms: hyperthermia |
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| hypnotherapy | (noun) the use of hypnosis in psychotherapy | - |
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| hypothermia | (noun) subnormal body temperature | - |
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| hypothermic | (adjective) of or relating to or affected by hypothermia | - |
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| immunotherapeutic | (adjective) of or relating to immunotherapy | - |
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| immunotherapy | (noun) therapy designed to produce immunity to a disease or to enhance resistance by the immune system | - |
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| incoherence | (noun) nonsense that is simply incoherent and unintelligible | Synonyms: incoherency, unintelligibility |
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| (noun) lack of cohesion or clarity or organization | Synonyms: incoherency |
| incoherency | (noun) nonsense that is simply incoherent and unintelligible | Synonyms: incoherence, unintelligibility |
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| (noun) lack of cohesion or clarity or organization | Synonyms: incoherence |
| incoherent | (adjective) without logical or meaningful connection | - |
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| (adjective) (physics) of waves having no stable definite or stable phase relation | - |
| (adjective) unable to express yourself clearly or fluently | Synonyms: tongue-tied |
| incoherently | (adverb) in an incoherent manner | - |
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| indecipherable | (adjective) not easily deciphered | Synonyms: unclear, undecipherable, unreadable |
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| (adjective) impossible to determine the meaning of | - |
| ingathering | (noun) request for a sum of money | Synonyms: appeal, collection, solicitation |
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| inhere | (verb) be inherent in something | - |
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| inherence | (noun) the state of inhering; the state of being a fixed characteristic | Synonyms: inherency |
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| inherency | (noun) the state of inhering; the state of being a fixed characteristic | Synonyms: inherence |
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| inherent | (adjective) in the nature of something though not readily apparent | Synonyms: implicit in, underlying |
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| (adjective) existing as an essential constituent or characteristic | Synonyms: built-in, constitutional, inbuilt, integral |
| inherently | (adverb) in an inherent manner | - |
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| inherit | (verb) obtain from someone after their death | - |
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| (verb) receive by genetic transmission | - |
| (verb) receive from a predecessor | - |
| inheritable | (adjective) capable of being inherited | Synonyms: heritable |
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| inheritance | (noun) hereditary succession to a title or an office or property | Synonyms: heritage |
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| (noun) any attribute or immaterial possession that is inherited from ancestors | Synonyms: heritage |
| (noun) (genetics) attributes acquired via biological heredity from the parents | Synonyms: hereditary pattern |
| (noun) that which is inherited; a title or property or estate that passes by law to the heir on the death of the owner | Synonyms: heritage |
| inherited | (adjective) occurring among members of a family usually by heredity | Synonyms: familial, genetic, hereditary, transmissible, transmitted |
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| inheriting | (adjective) having the legal right to inherit | - |
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| inheritor | (noun) a person who is entitled by law or by the terms of a will to inherit the estate of another | Synonyms: heir, heritor |
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| inheritress | (noun) a female heir | Synonyms: heiress, inheritrix |
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| inheritrix | (noun) a female heir | Synonyms: heiress, inheritress |
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| ionosphere | (noun) the outer region of the Earth's atmosphere; contains a high concentration of free electrons | - |
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| iontotherapy | (noun) therapy that uses a local electric current to introduce the ions of a medicine into the tissues | Synonyms: electromotive drug administration, EMDA, ionic medication, iontophoresis |
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| isogeotherm | (noun) an isogram connecting points of equal temperature below the surface of the earth. | - |
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| isothere | (noun) a line on a map linking places with the same mean summer temperature. | - |
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| isotherm | (noun) (meteorology) an isogram connecting points having the same temperature at a given time | - |
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| isothermal | (adjective) of a process or change taking place at constant temperature | - |
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| isothermic | (adjective) of or relating to an isotherm | - |
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| jagghery | (noun) unrefined brown sugar made from palm sap | Synonyms: jaggary, jaggery |
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| kilohertz | (noun) one thousand periods per second | Synonyms: kc, kHz, kilocycle, kilocycle per second |
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| kingfisher | (noun) nonpasserine large-headed bird with a short tail and long sharp bill; usually crested and bright-colored; feed mostly on fish | - |
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| kosher | (adjective) conforming to Jewish dietary laws | Synonyms: cosher |
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| (adjective) proper or legitimate | - |
| (noun) food that fulfills the requirements of Jewish dietary law | - |
| kosherness | (noun) The property of being fit to eat under Jewish dietary laws. | - |
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| languisher | (noun) a person who languishes | - |
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| lasher | (noun) a driver who urges the animals on with lashes of a whip | - |
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| lather | (noun) the froth produced by soaps or detergents | Synonyms: soapsuds, suds |
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| (noun) the foam resulting from excessive sweating (as on a horse) | - |
| (noun) a workman who puts up laths | - |
| (noun) agitation resulting from active worry | Synonyms: fret, stew, sweat, swither |
| (verb) rub soap all over, usually with the purpose of cleaning | Synonyms: soap |
| (verb) exude sweat or lather | - |
| (verb) form a lather | - |
| (verb) beat severely with a whip or rod | Synonyms: flog, lash, slash, strap, trounce, welt, whip |
| lathery | (adjective) resembling lather or covered with lather | Synonyms: sudsy |
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| laugher | (noun) an easy victory | Synonyms: blowout, romp, runaway, shoo-in, walkaway |
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| (noun) a person who is laughing or who laughs easily | - |
| launcher | (noun) armament in the form of a device capable of launching a rocket | Synonyms: rocket launcher |
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| (noun) a device that launches aircraft from a warship | Synonyms: catapult |
| leather | (noun) an animal skin made smooth and flexible by removing the hair and then tanning | - |
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| (verb) whip with a leather strap | - |
| leatherback | (noun) wide-ranging marine turtle with flexible leathery carapace; largest living turtle | Synonyms: Dermochelys coriacea, leatherback turtle, leathery turtle |
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| leathered | (adjective) resembling or made to resemble leather; tough but pliable | Synonyms: coriaceous, leatherlike, leathery |
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| leatherette | (noun) fabric made to look like leather | Synonyms: imitation leather |
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| leatherfish | (noun) any of several brightly colored tropical filefishes | Synonyms: leatherjacket |
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| leatherjack | (noun) any of several New World tropical fishes having tiny embedded scales | Synonyms: leatherjacket |
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| leatherjacket | (noun) any of several brightly colored tropical filefishes | Synonyms: leatherfish |
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| (noun) any of several New World tropical fishes having tiny embedded scales | Synonyms: leatherjack |
| (noun) tough-skinned larva of certain crane flies | - |
| leatherleaf | (noun) north temperate bog shrub with evergreen leathery leaves and small white cylindrical flowers | Synonyms: Chamaedaphne calyculata |
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| (noun) stiff leathery-leaved fern of western North America having ovate fronds parted to the midrib | Synonyms: coast polypody, leathery polypody, Polypodium scouleri |
| leatherlike | (adjective) resembling or made to resemble leather; tough but pliable | Synonyms: coriaceous, leathered, leathery |
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| leatherneck | (noun) a member of the United States Marine Corps | Synonyms: devil dog, Marine, shipboard soldier |
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| leatherwood | (noun) deciduous shrub of eastern North America having tough flexible branches and pliable bark and small yellow flowers | Synonyms: Dirca palustris, moose-wood, moosewood, ropebark, wicopy |
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| (noun) shrub or small tree of southeastern United States to West Indies and Brazil; grown for the slender racemes of white flowers and orange and crimson foliage | Synonyms: cyrilla, Cyrilla racemiflora, white titi |