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hacktivism(Internet) The practice of promoting a political agenda by hacking, especially by defacing or disabling websites.haemathermAlternative form of hematherm.halirenium(organic chemistry) Any reactive intermediate in the form of a three-membered unsaturated cyclic cation containing a positively charged halogen atomhammerbeamAlternative form of hammer beam.handwavium(informal, fiction) Any hypothetical but unobtainable material with desirable engineering properties.hardbottomA hard seafloor, typically a layer of sand covering rock.hashtivism(informal, derogatory) A form of Internet slacktivism based around the posting of messages that contain hashtags.haustellumA sucking organ, in the form of a proboscis, in many insects and crustaceanshaustoriumA root of a parasitic plant modified to take nourishment from its host.headstreamA stream that is the source of a river.heathendomThe state of being heathen.heathenismThe state of being, or behavior and thought, of heathens.hegemonismA policy of hegemony.heiressdomThe realm or sphere of heiresses.heliciformHaving the form of a helix; spiral; helical.heliotherm(biology) An ectotherm that obtains its energy by basking in the sun, as butterflies.hematogram(physiology, pathology) A graphic representation of significant components of a patient's blood (such as hemoglobin, erythrocytes and platelets)hemelytrumAlternative form of hemelytron.hemisacrum(anatomy) A defect involving the sacrum or the lower sacral vertebraehemisodiumDesignating an equal mixture of an acid and its sodium salthemosputum(pathology) The presence of blood in the sputum.henotheismBelief in or worship of one deity without denying the existence of other deities.hepatogramA hepatographic image.herotheismThe worship of a human hero as a god.hetericism(linguistics, obsolete) Heteric spelling.heteroatom(organic chemistry) Any atom which is not carbon or hydrogen.heterocosmA separate or alternative world.heterogramA word or phrase in which no letter occurs more than once.hexabarium(chemistry, in combination) Six atoms of barium in a chemical compound.hexaferrum(mineralogy) A hexagonal-dihexagonal dipyramidal yellowish steel gray mineral containing iridium, iron, osmium, and ruthenium.hexamerismsix-part radial symmetryhexasodium(chemistry, in combination) Six sodium atoms or ions in a compoundhidalgoismThe manners or attitudes of a hidalgo.hillstreamA swiftly-flowing stream, typically one that runs down a hillsidehipsterdomThe state of being a hipster.hipsterismSomething typical of a hipster.hirsuitismMisspelling of hirsutism.holidayism(dated, Christianity, derogatory) The tendency to treat the Sabbath as a day off rather than a solemn religious occasion.homeothermAny warm-blooded animal: one that maintains a stable internal body temperature regardless of external influence.hominiformSynonym of hominid.homorhythm(music) A style of music that has the same rhythm throughout.hongerblomSenecio arenarius, a South African ragwort with pink flowers.honorariumCompensation for services that do not have a predetermined value.hoodlumismBehavior characteristic of a hoodlum.horologium(uncommon) Synonym of astronomical clock.hulotheismAlternative form of hylotheism.humaniformLike a human or that of a human in form or appearance.humbuggismAlternative form of humbugism.humoralism(obsolete, medicine) The state or quality of being humoral.hyaloplasm(microbiology) A structureless fluid in cells; cytosolhydatiformResembling a hydatid.hydroeciumA sac attached onto a nectocalyx or swimming bell of specific types of oceanic hydrozoa.hydroplasmAlternative form of hydroplasma.hygroplasm(biology, archaic) The fluid portion of the cell protoplasm, in opposition to stereoplasm, the solid or insoluble portion.hylotheismTheory equating matter with God or merging one into the other (see pantheism).hymeniderm(mycology) A surface layer of lengthened cells arranged side by side on the spore-bearing surface of a fungus.hymeniform(mycology) Formed like the spore-bearing surface of a fungus.hyosternum(anatomy) hyoplastronhypandriumA plate, formed from fused coxites, covering the genitalia of a male insecthypanthium(botany) The bowl-shaped part of a flower on which the sepals, petals, and stamens are bornehypericismPhotosensitivity in livestock caused by consuming plants of the genus Hypericum.hyperprism(geometry) A prism that extends into hyperspace, having more than three dimensions.hypocorism(countable) A term of endearment, often a diminutive; a pet name.hypopodium(botany) The basal podium of a foliage leaf.hypoptilum(ornithology, rare) An aftershaft.hypopygiumA modified abdominal segment, in some insects, which supports the copulatory apparatushystricismA disease of the hair where the hairs stand erect.