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herself referring to the reflexive action of a female human or animal. [3 definitions]
hertz a unit of frequency equal to one cycle per second. (abbr.: Hz)
Hertzian wave an electromagnetic wave, such as a radio wave, produced when electricity is oscillated in a conductor.
Herzegovina see Bosnia and Herzegovina.
he's contracted form of "he is". ; contracted form of "he has".
Heshvan the second month of the Jewish lunisolar calendar, occurring from late October through early November in the Gregorian calendar.
hesitancy doubt, uncertainty, or indecision.
hesitant uncertain or in doubt; hesitating.
hesitate to refrain momentarily from carrying out some action; pause in uncertainty. [2 definitions]
hesitation the act or state of hesitating.
Hessian any of the German mercenaries that served with the British during the American Revolution.
Hessian fly a small fly, the larvae of which infest and consume the stems of grasses, wheat, and other grain plants.
hetaera in ancient Greek society, a female paramour or concubine, often a member of a class of educated slaves or cultured companions. [2 definitions]
hetero- different; other.
heterocyclic of or involving chemical compounds whose molecules are rings of carbon atoms with at least one atom of another element. [2 definitions]
heterodox deviating from an officially approved belief or doctrine, esp. in religion. [2 definitions]
heterodoxy the fact or condition of being heterodox. [2 definitions]
heterodyne of or designating a merging or method of merging two frequencies such that the resulting frequency equals the sum of or difference between the two, often accomplished by the modification of an incoming signal by a receiver. [3 definitions]
heterogamete either of a pair of uniting gametes, such as an ovum or a sperm, that differs from its mate in size, structure, activity, sex, or the like. (Cf. isogamete.)
heterogamous characterized by having, or reproducing by the union of, unlike gametes. [3 definitions]
heterogeneity the quality or state of being made up of parts or members that differ from each other.