| feverous | (adjective) having or affected by a fever | Synonyms: feverish |
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| fiberoptic | (adjective) of or relating to fiber optics | Synonyms: fiber-optic, fibre-optic, fibreoptic |
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| fiberoptics | (noun) the transmission of light signals via glass fibers | Synonyms: fiber optics, fibre optics, fibreoptics |
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| fireroom | (noun) (nautical) chamber or compartment in which the furnaces of a ship are stoked or fired | Synonyms: stokehold, stokehole |
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| flerovium | (noun) a radioactive transuranic element | Synonyms: Fl |
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| folderol | (noun) nonsensical talk or writing | Synonyms: applesauce, codswallop, rubbish, trash, tripe, trumpery, wish-wash |
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| fossiliferous | (adjective) bearing or containing fossils | - |
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| fumeroot | (noun) delicate European herb with greyish leaves and spikes of purplish flowers; formerly used medicinally | Synonyms: Fumaria officinalis, fumewort, fumitory |
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| (noun) herb of northern Europe and Asia having erect racemes of red flowers | Synonyms: Corydalis solida, fumewort |
| gasteromycete | (noun) any fungus of the class Gasteromycetes | Synonyms: gastromycete |
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| gastroenterologist | (noun) a physician who specializes in diseases of the gastrointestinal tract | - |
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| gastroenterology | (noun) the branch of medicine that studies the gastrointestinal tract and its diseases | - |
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| gastroenterostomy | (noun) surgical creation of an opening between the stomach wall and the small intestines; performed when the normal opening has been eliminated | - |
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| gemmiferous | (adjective) bearing or reproducing by a gemma | - |
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| generosity | (noun) acting generously | Synonyms: unselfishness |
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| (noun) the trait of being willing to give your money or time | Synonyms: generousness |
| generous | (adjective) willing to give and share unstintingly | - |
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| (adjective) not petty in character and mind | - |
| (adjective) more than is usual or necessary | - |
| generously | (adverb) in a generous manner | Synonyms: liberally, munificently |
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| generousness | (noun) the trait of being willing to give your money or time | Synonyms: generosity |
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| gerontocracy | (noun) a political system governed by old men | - |
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| gerontological | (adjective) of or relating to or practicing geriatrics | Synonyms: geriatric |
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| gerontologist | (noun) a specialist in gerontology | Synonyms: geriatrician |
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| gerontology | (noun) the branch of medical science that deals with diseases and problems specific to old people | Synonyms: geriatrics |
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| gingerol | (noun) derived from ginger; source of the hotness of ginger | - |
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| glycerogel | (noun) a medicated skin preparation made from glycerin and glycerinated gelatin | Synonyms: glycerogelatin |
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| glycerogelatin | (noun) a medicated skin preparation made from glycerin and glycerinated gelatin | Synonyms: glycerogel |
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| glycerol | (noun) a sweet syrupy trihydroxy alcohol obtained by saponification of fats and oils | Synonyms: glycerin, glycerine |
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| glycerole | (noun) a medicine made by mixing a substance in glycerin | Synonyms: glycerite |
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| glycerolise | (verb) place in glycerol | Synonyms: glycerolize |
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| glycerolize | (verb) place in glycerol | Synonyms: glycerolise |
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| granuliferous | (adjective) producing or full of granules | - |
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| graverobber | (noun) someone who takes bodies from graves and sells them for anatomical dissection | Synonyms: body snatcher, ghoul |
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| (noun) someone who steals valuables from graves or crypts | - |
| haemosiderosis | (noun) abnormal deposit of hemosiderin; often a symptom of thalassemia or hemochromatosis | Synonyms: hemosiderosis |
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| hedgerow | (noun) a fence formed by a row of closely planted shrubs or bushes | Synonyms: hedge |
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| hemerobiid | (noun) small dark-colored lacewing fly | Synonyms: brown lacewing, hemerobiid fly |
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| hemipteron | (noun) insects with sucking mouthparts and forewings thickened and leathery at the base; usually show incomplete metamorphosis | Synonyms: bug, hemipteran, hemipterous insect |
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| hemosiderosis | (noun) abnormal deposit of hemosiderin; often a symptom of thalassemia or hemochromatosis | Synonyms: haemosiderosis |
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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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| heterocercal | (adjective) possessing a tail with the upper lobe larger than the lower and with the vertebral column prolonged into the upper lobe | - |
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| heterocycle | (noun) a ring of atoms of more than one kind; especially a ring of carbon atoms containing at least one atom that is not carbon | Synonyms: heterocyclic ring |
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| (noun) a compound containing a heterocyclic ring | Synonyms: heterocyclic, heterocyclic compound |
| heterocyclic | (adjective) containing a closed ring of atoms of which at least one is not a carbon atom | - |
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| (noun) a compound containing a heterocyclic ring | Synonyms: heterocycle, heterocyclic compound |
| heterodactyl | (adjective) (of bird feet) having the first and second toes directed backward the third and fourth forward | - |
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| heterodox | (adjective) characterized by departure from accepted beliefs or standards | Synonyms: dissident, heretical |
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| heterodoxy | (noun) the quality of being unorthodox | Synonyms: unorthodoxy |
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| (noun) any opinions or doctrines at variance with the official or orthodox position | Synonyms: heresy, unorthodoxy |
| heterodyne | (adjective) of or relating to the beat produced by heterodyning two oscillations | - |
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| (verb) combine (a radio frequency wave) with a locally generated wave of a different frequency so as to produce a new frequency equal to the sum or the difference between the two | - |
| heteroecious | (adjective) of parasites; passing through different stages of the life cycle on different host species | - |
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| heterogeneity | (noun) the quality of being diverse and not comparable in kind | Synonyms: heterogeneousness |
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| heterogeneous | (adjective) consisting of elements that are not of the same kind or nature | Synonyms: heterogenous |
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| (adjective) originating outside the body | Synonyms: heterogenous |
| heterogeneousness | (noun) the quality of being diverse and not comparable in kind | Synonyms: heterogeneity |
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| heterogenesis | (noun) the alternation of two or more different forms in the life cycle of a plant or animal | Synonyms: alternation of generations, xenogenesis |
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| heterogenous | (adjective) originating outside the body | Synonyms: heterogeneous |
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| (adjective) consisting of elements that are not of the same kind or nature | Synonyms: heterogeneous |
| heterogloss | (noun) the locative boundary of a certain linguistic feature, such as the pronunciation of a vowel, the meaning of a word, or use of some syntactic feature. | Synonyms: isogloss |
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| heterograft | (noun) tissue from an animal of one species used as a temporary graft (as in cases of severe burns) on an individual of another species | Synonyms: xenograft |
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| heteroicous | (adjective) having several forms of gametoecia on the same plant | Synonyms: polygamous, polyoicous |
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| heterologic | (adjective) not corresponding in structure or evolutionary origin | Synonyms: heterological, heterologous |
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| heterological | (adjective) not corresponding in structure or evolutionary origin | Synonyms: heterologic, heterologous |
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| heterologous | (adjective) derived from organisms of a different but related species | - |
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| (adjective) not corresponding in structure or evolutionary origin | Synonyms: heterologic, heterological |
| heterology | (noun) (biology) the lack of correspondence of apparently similar body parts | - |
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| heterometabolic | (adjective) (of an insect) undergoing incomplete metamorphosis in which the nymph is essentially like the adult and there is no pupal stage | Synonyms: heterometabolous |
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| heterometabolism | (noun) development of insects with incomplete metamorphosis in which no pupal stage precedes maturity | Synonyms: heterometaboly |
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| heterometabolous | (adjective) (of an insect) undergoing incomplete metamorphosis in which the nymph is essentially like the adult and there is no pupal stage | Synonyms: heterometabolic |
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| heterometaboly | (noun) development of insects with incomplete metamorphosis in which no pupal stage precedes maturity | Synonyms: heterometabolism |
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| heteronym | (noun) two words are heteronyms if they are spelled the same way but differ in pronunciation | - |
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| heteroploid | (noun) (genetics) an organism or cell having a chromosome number that is not an even multiple of the haploid chromosome number for that species | - |
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| heteroploidy | (noun) the condition of being heteroploid | - |
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| heterosexism | (noun) discrimination in favor of heterosexual and against homosexual people | - |
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| heterosexual | (adjective) sexually attracted to members of the opposite sex | - |
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| (noun) a person having a sexual orientation to persons of the opposite sex | Synonyms: heterosexual person, straight, straight person |
| heterosexualism | (noun) a sexual attraction to (or sexual relations with) persons of the opposite sex | Synonyms: heterosexuality, straightness |
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| heterosexuality | (noun) a sexual attraction to (or sexual relations with) persons of the opposite sex | Synonyms: heterosexualism, straightness |
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| heterosis | (noun) (genetics) the tendency of a crossbred organism to have qualities superior to those of either parent | Synonyms: hybrid vigor |
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| heterosporous | (adjective) characterized by heterospory | - |
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| heterospory | (noun) the development of both microspores and megaspores | - |
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| heterostracan | (noun) extinct jawless fish with the anterior part of the body covered with bony plates; of the Silurian and Devonian | - |
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| heterotaxy | (noun) any abnormal position of the organs of the body | Synonyms: transposition |
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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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| heterotroph | (noun) an organism that depends on complex organic substances for nutrition | - |
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| heterotrophic | (adjective) requiring organic compounds of carbon and nitrogen for nourishment | - |
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| heterozygosity | (noun) the state of being heterozygous; having two different alleles of the same gene | - |
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| heterozygote | (noun) (genetics) an organism having two different alleles of a particular gene and so giving rise to varying offspring | - |
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| heterozygous | (adjective) having dissimilar alleles at corresponding chromosomal loci | - |
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| hierocracy | (noun) a ruling body composed of clergy | - |
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| hieroglyph | (noun) a writing system using picture symbols; used in ancient Egypt | Synonyms: hieroglyphic |
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| (noun) writing that resembles hieroglyphics (usually by being illegible) | Synonyms: hieroglyphic |
| hieroglyphic | (adjective) written in or belonging to a writing system using pictorial symbols | Synonyms: hieroglyphical |
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| (adjective) resembling hieroglyphic writing | Synonyms: hieroglyphical |
| (noun) a writing system using picture symbols; used in ancient Egypt | Synonyms: hieroglyph |
| (noun) writing that resembles hieroglyphics (usually by being illegible) | Synonyms: hieroglyph |
| hieroglyphical | (adjective) written in or belonging to a writing system using pictorial symbols | Synonyms: hieroglyphic |
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| (adjective) resembling hieroglyphic writing | Synonyms: hieroglyphic |
| hieroglyphically | (adverb) by means of hieroglyphs | - |
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| hierolatry | (noun) the worship of saints | Synonyms: hagiolatry |
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| homeroom | (noun) a classroom in which all students in a particular grade (or in a division of a grade) meet at certain times under the supervision of a teacher who takes attendance and does other administrative business | Synonyms: home room |
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| homoerotic | (adjective) of or concerning homosexual love | - |
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| homoeroticism | (noun) a sexual attraction to (or sexual relations with) persons of the same sex | Synonyms: gayness, homosexualism, homosexuality, queerness |
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| houseroom | (noun) space for accommodation in a house | - |
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| hymenopteron | (noun) insects having two pairs of membranous wings and an ovipositor specialized for stinging or piercing | Synonyms: hymenopter, hymenopteran, hymenopterous insect |
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| hymenopterous | (adjective) of or relating to insects of the order Hymenoptera | - |
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