| hesitancy | (noun) a certain degree of unwillingness | Synonyms: disinclination, hesitation, indisposition, reluctance |
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| (noun) a feeling of diffidence and indecision about doing something | Synonyms: hesitance |
| hesitant | (adjective) lacking decisiveness of character; unable to act or decide quickly or firmly | Synonyms: hesitating |
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| hesitantly | (adverb) with hesitation; in a hesitant manner | Synonyms: hesitatingly |
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| hesitate | (verb) pause or hold back in uncertainty or unwillingness | Synonyms: waffle, waver |
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| (verb) interrupt temporarily an activity before continuing | Synonyms: pause |
| hesitater | (noun) one who hesitates (usually out of fear) | Synonyms: hesitator, vacillator, waverer |
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| hesitating | (adjective) lacking decisiveness of character; unable to act or decide quickly or firmly | Synonyms: hesitant |
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| hesitatingly | (adverb) with hesitation; in a hesitant manner | Synonyms: hesitantly |
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| hesitation | (noun) the act of pausing uncertainly | Synonyms: falter, faltering, waver |
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| (noun) a certain degree of unwillingness | Synonyms: disinclination, hesitancy, indisposition, reluctance |
| (noun) indecision in speech or action | Synonyms: vacillation, wavering |
| hesitator | (noun) one who hesitates (usually out of fear) | Synonyms: hesitater, vacillator, waverer |
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| hessian | (noun) (19th century) a man's high tasseled boot | Synonyms: Hessian boot, jackboot, Wellington, Wellington boot |
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| hessonite | (noun) a garnet ranging in color from yellow to brown | Synonyms: cinnamon stone, essonite |
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| het | (adjective) made warm or hot (`het' is a dialectal variant of `heated') | Synonyms: heated, heated up, het up |
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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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| heth | (noun) the 8th letter of the Hebrew alphabet | - |
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| heulandite | (noun) a group of minerals of the zeolite family consisting of a hydrous aluminum silicate of sodium and calcium | - |
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| heuristic | (adjective) of or relating to or using a general formulation that serves to guide investigation | - |
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| (noun) a commonsense rule (or set of rules) intended to increase the probability of solving some problem | Synonyms: heuristic program, heuristic rule |
| hew | (verb) strike with an axe; cut down, strike | - |
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| (verb) make or shape as with an axe | Synonyms: hew out |
| hewer | (noun) a person who hews | - |
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| hewn | (adjective) cut or shaped with hard blows of a heavy cutting instrument like an ax or chisel | Synonyms: hand-hewn |
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| hex | (adjective) of or pertaining to a number system having 16 as its base | Synonyms: hexadecimal |
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| (noun) an evil spell | Synonyms: curse, jinx, whammy |
| (verb) cast a spell over someone or something; put a hex on someone or something | Synonyms: bewitch, enchant, glamour, jinx, witch |
| hexachlorophene | (noun) antibacterial substance that is a water-soluble powder used in antiseptic soaps and toothpaste | - |
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| hexad | (noun) the cardinal number that is the sum of five and one | Synonyms: 6, Captain Hicks, half a dozen, sestet, sextet, sextuplet, sise, six, sixer, VI |
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| hexadecimal | (adjective) of or pertaining to a number system having 16 as its base | Synonyms: hex |
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| hexagon | (noun) a six-sided polygon | - |
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| hexagonal | (adjective) having six sides or divided into hexagons | Synonyms: hexangular |
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| hexagram | (noun) a regular polygon formed by extending each of the sides of a regular hexagon to form two equilateral triangles | - |
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| hexahedron | (noun) any polyhedron having six plane faces | - |
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| hexakosioihexekontahexaphobia | (noun) fear of magic properties of the number 666 | - |
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| hexameter | (noun) a verse line having six metrical feet | - |
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| hexane | (noun) a colorless flammable liquid alkane derived from petroleum and used as a solvent | - |
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| hexangular | (adjective) having six sides or divided into hexagons | Synonyms: hexagonal |
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| hexapod | (noun) an animal having six feet | - |
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| hexed | (adjective) (usually used colloquially) causing or accompanied by misfortune | Synonyms: jinxed |
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| hexenbesen | (noun) an abnormal tufted growth of small branches on a tree or shrub caused by fungi or insects or other physiological disturbance | Synonyms: staghead, witch broom, witches' broom |
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| hexestrol | (noun) estrogen compound used to treat menstrual irregularities and menopausal symptoms and to prevent pregnancy | - |
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| hexine | (noun) a hydrocarbon, C6H10, of the acetylene series. | - |
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| hexose | (noun) a monosaccharide that contains six carbon atoms per molecule | - |
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| heyday | (noun) the period of greatest prosperity or productivity | Synonyms: bloom, blossom, efflorescence, flower, flush, peak, prime |
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