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haemotympanumAlternative form of hemotympanum.halobacteriumAny of various extremophiles, of genus Halobacterium, found in water saturated or nearly saturated with salt.hecastotheism(archaic) A general form of animism in which both animate and inanimate objects are believed to have supernatural powers.hectokilogram(dated) A unit of mass equal to 100,000 grams.helimagnetism(physics) a property of some metals and of some salts of transition elements at low temperature in which the atomic magnetic moments are arranged in a helixheliocentrism(astronomy, history) The theory that the sun is the center of the universe.heliochromism(physics, chemistry) The property of certain photochromic materials of colouring in near-ultraviolet light and then fading in its absence; they are used in the lenses of sunglasseshemicholiniumSynonym of hemicholine.hemidiaphragm(anatomy) Either the left or right half of the diaphragmhemigigantism(medicine) Hemihypertrophy.hepatotropismThe condition of being hepatotropicheptaluminium(chemistry, in combination) Seven atoms of aluminium in a chemical compound. Al₇heptaplatinum(chemistry, in combination) Seven atoms of platinum in a chemical compound. Pt₇heptatitanium(chemistry, in combination) Seven atoms of titanium in a chemical compound. Ti₇hermaphrodismAlternative spelling of hermaphroditism.heterocarpismSynonym of heterocarpy.heterodontism(zoology) Having a dentition of differing teeth.heteroerotismSynonym of heteroeroticism.heterofascismAlternative spelling of hetero-fascism.heterophobism(very rare) Synonym of heterophobia (“the fear or resentment of heterosexuals or heterosexuality”)heterostylism(botany) heterostylyhexaaluminium(chemistry, in combination) Six aluminium atoms or ions in a compound (Al₆).hexafluronium(pharmacology) A muscle relaxant that acts as a nicotinic acetylcholine receptor antagonist.hexamagnesium(chemistry, in combination) Six magnesium atoms or ions in a compound (Mg₆).hexamethonium(pharmacology) Synonym of hexamethonium bromide.hexapotassium(inorganic chemistry, in combination) Six potassium atoms or ions in a compoundhistiotropismMisspelling of histotropism.histrionicismThe histrionic art; stageplaying.hodiecentrismthe practice of viewing today's problems as natural and eternalhomeomorphism(topology) a continuous bijection from one topological space to another, with continuous inverse.homeothermismThe quality of being homeothermic.homoeopathismAlternative form of homeopathism.homoeroticismThe state or quality of being homoerotichomoousianismThe beliefs of the homoousians.homosexualism(derogatory) A purported ideology behind (and promoting) homosexuality; gayness viewed as an ideology rather than a sexual orientation.horizontalismA political or social theory or system that advocates the equitable distribution of power in a society.horohalinicum(biology) A salinity zone (between 5% and 8% salt) that is supposed to mark the boundary between freshwater and marine organismshusbullhookum(India, historical) A document issued by officers of state on royal authority, serving as a grant or a decree.hydridoheliumSynonym of helium hydride.hydrochinonumhydroquinonehydrocyanicum(obsolete, medicine) hydrocyanic acid, prussic acid, a colorless liquid obtained from amygdalin, present in bitter almonds, peach stones, plums and laurel leaveshydrodynamismThe stress put on a marine organism (especially an intertidal one) by hydrodynamic factorshydroethidium(organic chemistry) Synonym of dihydroethidium.hydromorphism(soil science) The condition of being hydromorphichydrophyllium(archaic, zoology) One of the flat, leaf-like, protective zooids covering other zooids of certain Siphonophorae.hyperactivismA high level of involvement in activism.hyperaltruismExtreme altruismhyperarchaismA hyperarchaic phrase or expression.hyperatticism(linguistics, Hellenics) A hypercorrection or incorrect substitution of non-Attic Ancient Greek word forms and morphology to match those of Attic Greek.hyperboliform(obsolete) Having the form of a hyperbola; hyperbolichyperchromismSynonym of hyperchromicity.hyperdynamism(ecology) Excessive movement between the parts of a fragmented habitathypergonadismHyperfunction of the gonads.hyperlocalismnews coverage of very local events, especially to the exclusion of more important world eventshypermelanism(pathology) An excess of melanin in the skinhypermorphism(genetics) A hypermorphic mutationhyperreninismhyperreninemic hyperaldosteronismhypersplenism(medicine) A disorder in which abnormal spleen activity destroys blood cells.hyperstriatumThe part of the avian forebrain associated with intelligence.hypertelorism(anatomy) An abnormally increased distance between two organs or body parts, usually the eyes.hyperurbanism(linguistics) the creation of a non-standard form by mimicking the standard dialect.hypochondrism(pathology) hypochondriahypochondrium(anatomy) The upper region of the abdomen, covering the upperribs, at each side of the epigastrium.hypoechoicismSynonym of hypoechoicity.hyracotheriumAny of the extinct genus †Hyracotherium of ungulates.