| hafnium | (noun) a grey tetravalent metallic element that resembles zirconium chemically and is found in zirconium minerals; used in filaments for its ready emission of electrons | Synonyms: atomic number 72, Hf |
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| hagionym | (noun) The name of a Saint taken as a proper name. | - |
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| hahnium | (noun) a transuranic element with atomic number 105 | Synonyms: atomic number 105, Db, dubnium, element 105 |
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| hailstorm | (noun) a storm during which hail falls | - |
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| hakeem | (noun) a Muslim physician | Synonyms: hakim |
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| hakim | (noun) a Muslim physician | Synonyms: hakeem |
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| (noun) a Muslim ruler or governor or judge | - |
| halm | (noun) stems of beans and peas and potatoes and grasses collectively as used for thatching and bedding | Synonyms: haulm |
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| halobacterium | (noun) halophiles in saline environments such as the Dead Sea or salt flats | Synonyms: halobacter, halobacteria |
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| haloform | (noun) compounds with the formula CHX3, where X is a halogen atom | - |
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| ham | (noun) meat cut from the thigh of a hog (usually smoked) | Synonyms: gammon, jambon |
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| (noun) an unskilled actor who overacts | Synonyms: ham actor |
| (noun) a licensed amateur radio operator | - |
| (verb) exaggerate one's acting | Synonyms: ham it up, overact, overplay |
| handloom | (noun) a loom powered by hand | - |
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| hansom | (noun) a two-wheeled horse-drawn covered carriage with the driver's seat above and behind the passengers | Synonyms: hansom cab |
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| hareem | (noun) living quarters reserved for wives and concubines and female relatives in a Muslim household | Synonyms: harem, seraglio, serail |
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| harem | (noun) living quarters reserved for wives and concubines and female relatives in a Muslim household | Synonyms: hareem, seraglio, serail |
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| harm | (noun) the act of damaging something or someone | Synonyms: damage, hurt, scathe |
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| (noun) the occurrence of a change for the worse | Synonyms: damage, impairment |
| (noun) any physical damage to the body caused by violence or accident or fracture etc.; the condition of an injury | Synonyms: hurt, injury, trauma |
| (verb) cause or do harm to | - |
| harmonium | (noun) a free-reeded instrument with a piano keyboard in which air is forced through the reeds by bellows | Synonyms: organ, reed organ |
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| hassium | (noun) a radioactive transuranic element, with atomic number 108 | Synonyms: atomic number 108, element 108, Hs |
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| haulm | (noun) stems of beans and peas and potatoes and grasses collectively as used for thatching and bedding | Synonyms: halm |
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| haustorium | (noun) a root-like attachment in parasitic plants that penetrates and obtains food from the host | - |
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| headroom | (noun) the capacity of a system to reproduce loud sounds without distortion | Synonyms: dynamic headroom |
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| (noun) vertical space available to allow easy passage under something | Synonyms: clearance, headway |
| headstream | (noun) a stream that forms the source of a river | - |
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| heathenism | (noun) any of various religions other than Christianity or Judaism or Islamism | Synonyms: pagan religion, paganism |
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| hectogram | (noun) 100 grams | Synonyms: hg |
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| hedonism | (noun) an ethical system that evaluates the pursuit of pleasure as the highest good | - |
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| (noun) the pursuit of pleasure as a matter of ethical principle | - |
| heirloom | (noun) something that has been in a family for generations | - |
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| (noun) (law) any property that is considered by law or custom as inseparable from an inheritance is inherited with that inheritance | - |
| helianthemum | (noun) any plant of the genus Helianthemum; vigorous plants of stony alpine meadows and dry scrub regions | Synonyms: sun rose, sunrose |
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| heliogram | (noun) a message transmitted by means of the sun's rays | - |
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| heliotropism | (noun) an orienting response to the sun | - |
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| helium | (noun) a very light colorless element that is one of the six inert gasses; the most difficult gas to liquefy; occurs in economically extractable amounts in certain natural gases (as those found in Texas and Kansas) | Synonyms: atomic number 2, He |
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| helm | (noun) (figurative) a position of leadership | - |
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| (noun) steering mechanism for a vessel; a mechanical device by which a vessel is steered | - |
| (verb) be at or take the helm of | - |
| hem | (noun) the edge of a piece of cloth; especially the finished edge that has been doubled under and stitched down | - |
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| (noun) the utterance of a sound similar to clearing the throat; intended to get attention, express hesitancy, fill a pause, hide embarrassment, warn a friend, etc. | Synonyms: ahem |
| (verb) utter `hem' or `ahem' | - |
| (verb) fold over and sew together to provide with a hem | - |
| hemidrachm | (noun) an ancient Greek silver coin equal to 1/2 drachm or 3 obols in value. | - |
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| hemimetabolism | (noun) incomplete or partial metamorphosis in insects | Synonyms: hemimetaboly, hemimetamorphosis |
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| herbarium | (noun) a collection of dried plants that are mounted and systematically classified for study | - |
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| hereditarianism | (noun) the philosophical doctrine that heredity is more important than environment in determining intellectual growth | - |
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| herm | (noun) a statue consisting of a squared stone pillar with a carved head (usually a bearded Hermes) on top; used in ancient Greece as a boundary marker or signpost | - |
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| hermaphrodism | (noun) congenital condition in which external genitalia and internal sex organs have both male and female characteristics | Synonyms: hermaphroditism |
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| hermaphroditism | (noun) showing characteristics of both sexes | Synonyms: androgyny, bisexuality |
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| (noun) congenital condition in which external genitalia and internal sex organs have both male and female characteristics | Synonyms: hermaphrodism |
| 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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| heterometabolism | (noun) development of insects with incomplete metamorphosis in which no pupal stage precedes maturity | Synonyms: heterometaboly |
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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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| heterosexism | (noun) discrimination in favor of heterosexual and against homosexual people | - |
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| heterosexualism | (noun) a sexual attraction to (or sexual relations with) persons of the opposite sex | Synonyms: heterosexuality, straightness |
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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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| hilum | (noun) (anatomy) a depression or fissure where vessels or nerves or ducts enter a bodily organ | Synonyms: hilus |
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| (noun) the scar on certain seeds marking its point of attachment to the funicle | - |
| hippeastrum | (noun) amaryllis of tropical America often cultivated as a houseplant for its showy white to red flowers | Synonyms: Hippeastrum puniceum |
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| hirsutism | (noun) excessive hairiness | Synonyms: hirsuteness |
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| histogram | (noun) a bar chart representing a frequency distribution; heights of the bars represent observed frequencies | - |
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| historicism | (noun) a theory that social and cultural events are determined by history | - |
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| hm | (noun) a metric unit of length equal to 100 meters | Synonyms: hectometer, hectometre |
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| hobbyism | (noun) a devotion to hobbies | - |
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| hokum | (noun) a message that seems to convey no meaning | Synonyms: bunk, meaninglessness, nonsense, nonsensicality |
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| holism | (noun) the theory that the parts of any whole cannot exist and cannot be understood except in their relation to the whole | Synonyms: holistic theory |
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| holmium | (noun) a trivalent metallic element of the rare earth group; occurs together with yttrium; forms highly magnetic compounds | Synonyms: atomic number 67, Ho |
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| hologram | (noun) the intermediate photograph (or photographic record) that contains information for reproducing a three-dimensional image by holography | Synonyms: holograph |
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| holometabolism | (noun) complete metamorphosis in insects | Synonyms: holometaboly |
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| holonym | (noun) a word that names the whole of which a given word is a part | Synonyms: whole name |
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| homeotherm | (noun) an animal that has a body temperature that is relatively constant and independent of the environmental temperature | Synonyms: homoiotherm, homotherm |
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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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| homoeroticism | (noun) a sexual attraction to (or sexual relations with) persons of the same sex | Synonyms: gayness, homosexualism, homosexuality, queerness |
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| homoiotherm | (noun) an animal that has a body temperature that is relatively constant and independent of the environmental temperature | Synonyms: homeotherm, homotherm |
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| homomorphism | (noun) similarity of form | Synonyms: homomorphy |
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| homonym | (noun) two words are homonyms if they are pronounced and spelled the same way but have different meanings | - |
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| homosexualism | (noun) a sexual attraction to (or sexual relations with) persons of the same sex | Synonyms: gayness, homoeroticism, homosexuality, queerness |
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| homotherm | (noun) an animal that has a body temperature that is relatively constant and independent of the environmental temperature | Synonyms: homeotherm, homoiotherm |
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| honorarium | (noun) a fee paid for a nominally free service | - |
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| hoodlum | (noun) an aggressive and violent young criminal | Synonyms: goon, hood, punk, strong-armer, thug, tough, toughie |
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| hoodooism | (noun) a religious cult practiced chiefly in Caribbean countries (especially Haiti); involves witchcraft and animistic deities | Synonyms: vodoun, voodoo, voodooism |
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| hookworm | (noun) parasitic bloodsucking roundworms having hooked mouth parts to fasten to the intestinal wall of human and other hosts | - |
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| (noun) infestation of the intestines by hookworms which enter the body (usually) through the skin | Synonyms: hookworm disease |
| hooliganism | (noun) willful wanton and malicious destruction of the property of others | Synonyms: malicious mischief, vandalism |
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| hordeolum | (noun) an infection of the sebaceous gland of the eyelid | Synonyms: eye infection, sty, stye |
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| hormism | (noun) psychology concerned with the purposive factor or force in behavior. | Synonyms: hormic psychology |
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| hornbeam | (noun) any of several trees or shrubs of the genus Carpinus | - |
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| houseroom | (noun) space for accommodation in a house | - |
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| hoydenism | (noun) masculinity in women (especially in girls and young women) | Synonyms: tomboyishness |
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| hum | (noun) a humming noise | Synonyms: humming |
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| (noun) the state of being or appearing to be actively engaged in an activity | Synonyms: busyness |
| (verb) sing with closed lips | - |
| (verb) make a low continuous sound | - |
| (verb) sound with a monotonous hum | Synonyms: thrum |
| (verb) be noisy with activity | Synonyms: buzz, seethe |
| humanism | (noun) the doctrine emphasizing a person's capacity for self-realization through reason; rejects religion and the supernatural | Synonyms: secular humanism |
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| (noun) the doctrine that people's duty is to promote human welfare | Synonyms: humanitarianism |
| (noun) the cultural movement of the Renaissance; based on classical studies | - |
| humanitarianism | (noun) the doctrine that people's duty is to promote human welfare | Synonyms: humanism |
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| humdrum | (adjective) tediously repetitious or lacking in variety | Synonyms: monotonous |
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| (adjective) not challenging; dull and lacking excitement | Synonyms: commonplace, prosaic, unglamorous, unglamourous |
| (noun) the quality of wearisome constancy, routine, and lack of variety | Synonyms: monotony, sameness |
| hyaloplasm | (noun) the clear nongranular portion of the cytoplasm of a cell | Synonyms: ground substance |
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| hydrargyrum | (noun) a heavy silvery toxic univalent and bivalent metallic element; the only metal that is liquid at ordinary temperatures | Synonyms: atomic number 80, Hg, mercury, quicksilver |
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| hymenium | (noun) spore-bearing layer of cells in certain fungi containing asci or basidia | - |
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| hypanthium | (noun) the cuplike or ringlike or tubular structure of a flower which bears the sepals and stamens and calyx (as in Rosaceae) | Synonyms: calyx tube, floral cup |
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| hyperadrenalism | (noun) a glandular disorder caused by excessive ACTH resulting in greater than normal functioning of the adrenal gland; characterized by obesity | Synonyms: Cushing's disease |
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| hyperadrenocorticism | (noun) a glandular disorder caused by excessive cortisol | Synonyms: Cushing's syndrome |
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| hyperaldosteronism | (noun) a condition caused by overproduction of aldosterone | Synonyms: aldosteronism |
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| hyperbolism | (noun) the use of hyperbole. | - |
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| hypercriticism | (noun) Excessive or unfairly harsh criticism. | - |
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| hypericism | (noun) a severe dermatitis of herbivorous domestic animals attributable to photosensitivity from eating Saint John's wort | - |
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| hypernym | (noun) a word that is more generic than a given word | Synonyms: superordinate, superordinate word |
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| hyperparathyroidism | (noun) excessive secretion of parathyroid hormone resulting in abnormally high levels of calcium in the blood; can affect many systems of the body (especially causing bone resorption and osteoporosis) | - |
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| hyperpituitarism | (noun) excessive activity of the pituitary gland (especially overactivity of the anterior lobe which leads to excess secretion of growth hormone) | - |
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| hypersplenism | (noun) enlarged spleen and a decrease in one or more types of blood cells; associated with many disorders | - |
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| hyperthyroidism | (noun) an overactive thyroid gland; pathologically excessive production of thyroid hormones or the condition resulting from excessive production of thyroid hormones | Synonyms: thyrotoxicosis |
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| hypnotism | (noun) the act of inducing hypnosis | Synonyms: mesmerism, suggestion |
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| hypoadrenalism | (noun) a glandular disorder caused by failure of function of the cortex of the adrenal gland and marked by anemia and prostration with brownish skin | Synonyms: Addison's disease, Addison's syndrome, hypoadrenocorticism |
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| hypoadrenocorticism | (noun) a glandular disorder caused by failure of function of the cortex of the adrenal gland and marked by anemia and prostration with brownish skin | Synonyms: Addison's disease, Addison's syndrome, hypoadrenalism |
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| hypobasidium | (noun) special cell constituting the base of the basidium in various fungi especially of the order Tremellales | - |
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| hypochondrium | (noun) the upper region of the abdomen just below the lowest ribs on either side of the epigastrium | - |
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| hypocorism | (noun) a name of endearment (especially one using a diminutive suffix) | Synonyms: pet name |
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