| hepatotoxin | (noun) any toxin that affects the liver | - |
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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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| heterozygote | (noun) (genetics) an organism having two different alleles of a particular gene and so giving rise to varying offspring | - |
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| hidrotic | (adjective) of or relating to sweat | - |
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| hindfoot | (noun) a rear foot of a quadruped | - |
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| hippopotamus | (noun) massive thick-skinned herbivorous animal living in or around rivers of tropical Africa | Synonyms: hippo, Hippopotamus amphibius, river horse |
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| holothurian | (noun) echinoderm having a flexible sausage-shaped body, tentacles surrounding the mouth and tube feet; free-living mud feeders | Synonyms: sea cucumber |
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| holotype | (noun) the original specimen from which the description of a new species is made | Synonyms: type specimen |
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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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| homeothermic | (adjective) of birds and mammals; having constant and relatively high body temperature | Synonyms: homoiothermic, homothermic |
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| homoerotic | (adjective) of or concerning homosexual love | - |
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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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| homoiothermic | (adjective) of birds and mammals; having constant and relatively high body temperature | Synonyms: homeothermic, homothermic |
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| homothecy | (noun) (mathematics) an isotropic scaling transformation of an affine space with a single fixed point. | Synonyms: homothety |
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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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| homothermic | (adjective) of birds and mammals; having constant and relatively high body temperature | Synonyms: homeothermic, homoiothermic |
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| homothety | (noun) (mathematics) an isotropic scaling transformation of an affine space with a single fixed point. | Synonyms: homothecy |
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| homotoxicology | (noun) analysis of sickness within the framework of the body's failure to deal with the burden of toxins. Homeopathic remedies often are used as treatment. Developed by Hans Heinrich Reckeweg. | - |
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| homozygote | (noun) (genetics) an organism having two identical alleles of a particular gene and so breeding true for the particular characteristic | - |
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| honeypot | (noun) South African shrub whose flowers when open are cup-shaped resembling artichokes | Synonyms: king protea, Protea cynaroides |
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| hoot | (noun) something of little value | Synonyms: damn, darn, red cent, shit, shucks, tinker's dam, tinker's damn |
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| (noun) a loud raucous cry (as of an owl) | - |
| (noun) a cry or noise made to express displeasure or contempt | Synonyms: bird, boo, Bronx cheer, hiss, raspberry, razz, razzing, snort |
| (verb) to utter a loud clamorous shout | - |
| (verb) utter the characteristic sound of owls | - |
| hootch | (noun) an illicitly distilled (and usually inferior) alcoholic liquor | Synonyms: hooch |
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| hooter | (noun) nocturnal bird of prey with hawk-like beak and claws and large head with front-facing eyes | Synonyms: bird of Minerva, bird of night, owl |
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| (noun) a device on an automobile for making a warning noise | Synonyms: automobile horn, car horn, horn, motor horn |
| (noun) informal terms for the nose | Synonyms: beak, honker, nozzle, schnoz, schnozzle, snoot, snout |
| hopscotch | (noun) a game in which a child tosses a stone into an area drawn on the ground and then hops through it and back to regain the stone | - |
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| horsecloth | (noun) a cloth for the trapping of a horse | - |
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| hot | (adjective) used of physical heat; having a high or higher than desirable temperature or giving off heat or feeling or causing a sensation of heat or burning | - |
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| (adjective) (extended meanings, especially of psychological heat) marked by intensity or vehemence especially of passion or enthusiasm | - |
| (adjective) marked by excited activity | - |
| (adjective) charged or energized with electricity | Synonyms: live |
| (adjective) having or showing great eagerness or enthusiasm | - |
| (adjective) very fast; capable of quick response and great speed | Synonyms: blistering, red-hot |
| (adjective) made recently | - |
| (adjective) very good; often used in the negative | - |
| (adjective) recently stolen or smuggled | - |
| (adjective) having or bringing unusually good luck | - |
| (adjective) of a seeker; very near to the object sought | - |
| (adjective) newest or most recent | Synonyms: red-hot |
| (adjective) very popular or successful | - |
| (adjective) having or dealing with dangerously high levels of radioactivity | - |
| (adjective) sexually excited or exciting | - |
| (adjective) performed or performing with unusually great skill and daring and energy | - |
| (adjective) producing a burning sensation on the taste nerves | Synonyms: spicy |
| (adjective) very unpleasant or even dangerous | - |
| (adjective) characterized by violent and forceful activity or movement; very intense | Synonyms: raging |
| (adjective) wanted by the police | - |
| (adjective) (color) bold and intense | - |
| hotbed | (noun) a bed of earth covered with glass and heated by rotting manure to promote the growth of plants | - |
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| (noun) a situation that is ideal for rapid development (especially of something bad) | - |
| hotbox | (noun) a journal bearing (as of a railroad car) that has overheated | - |
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| hotcake | (noun) a flat cake of thin batter fried on both sides on a griddle | Synonyms: battercake, flannel-cake, flannel cake, flapcake, flapjack, griddlecake, hot cake, pancake |
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| hotchpotch | (noun) a stew (or thick soup) made with meat and vegetables | - |
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| (noun) a motley assortment of things | Synonyms: farrago, gallimaufry, hodgepodge, melange, mingle-mangle, mishmash, oddments, odds and ends, omnium-gatherum, ragbag |
| hotdog | (noun) a smooth-textured sausage of minced beef or pork usually smoked; often served on a bread roll | Synonyms: dog, frank, frankfurter, hot dog, weenie, wiener, wienerwurst |
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| (noun) a frankfurter served hot on a bun | Synonyms: hot dog, red hot |
| (noun) someone who performs dangerous stunts to attract attention to himself | Synonyms: hot dog |
| hotel | (noun) a building where travelers can pay for lodging and meals and other services | - |
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| hotelier | (noun) an owner or manager of hotels | Synonyms: hosteller, hotel manager, hotelkeeper, hotelman |
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| hotelkeeper | (noun) an owner or manager of hotels | Synonyms: hosteller, hotel manager, hotelier, hotelman |
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| hotelman | (noun) an owner or manager of hotels | Synonyms: hosteller, hotel manager, hotelier, hotelkeeper |
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| hotfoot | (noun) a practical joke that involves inserting a match surreptitiously between the sole and upper of the victim's shoe and then lighting it | - |
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| (adverb) without delay; speedily | - |
| (verb) move hurridly | Synonyms: belt along, bucket along, cannonball along, hasten, hie, pelt along, race, rush, rush along, speed, step on it |
| hothead | (noun) a reckless impetuous irresponsible person | Synonyms: daredevil, harum-scarum, lunatic, madcap, swashbuckler |
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| (noun) a belligerent grouch | Synonyms: fire-eater |
| hotheaded | (adjective) quickly aroused to anger | Synonyms: choleric, hot-tempered, irascible, quick-tempered, short-tempered |
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| (adjective) characterized by undue haste and lack of thought or deliberation | Synonyms: brainish, impetuous, impulsive, madcap, tearaway |
| hothouse | (noun) a greenhouse in which plants are arranged in a pleasing manner | Synonyms: conservatory, indoor garden |
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| hotline | (noun) a telefone line that provides direct and prompt information or advice to the caller in relation to a specific subject | Synonyms: hot line |
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| hotly | (adverb) in a heated manner | Synonyms: heatedly |
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| hotness | (noun) the presence of heat | Synonyms: heat, high temperature |
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| (noun) a hot spiciness | Synonyms: pepperiness |
| (noun) a state of sexual arousal | Synonyms: horniness, hot pants |
| hotplate | (noun) a portable electric appliance for heating or cooking or keeping food warm | Synonyms: hot plate |
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| hotpot | (noun) a stew of meat and potatoes cooked in a tightly covered pot | Synonyms: hot pot |
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| hotshot | (noun) someone who is dazzlingly skilled in any field | Synonyms: ace, adept, champion, genius, maven, mavin, sensation, star, superstar, virtuoso, whiz, whizz, wiz, wizard |
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| hotspot | (noun) a lively entertainment spot | Synonyms: hot spot |
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| (noun) a point of relatively intense heat or radiation | Synonyms: hot spot |
| (noun) a place of political unrest and potential violence | Synonyms: flashpoint, hot spot, trouble spot |
| hotspur | (noun) a rash or impetuous person | - |
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| hottish | (adjective) somewhat hot | - |
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| housemother | (noun) a woman employed as a chaperon in a residence for young people | - |
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| hydrochlorothiazide | (noun) a diuretic drug (trade name Microzide, Esidrix, and HydroDIURIL) used in the treatment of hypertension | Synonyms: Esidrix, HydroDIURIL, Microzide |
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| hydrotherapy | (noun) the internal and external use of water in the treatment of disease | Synonyms: hydropathy |
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| hydrothorax | (noun) accumulation of fluid in the pleural cavity (the space between the lungs and the walls of the chest) often resulting from disease of the heart or kidneys | - |
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| hyperbetalipoproteinemia | (noun) a genetic disorder characterized by high levels of beta-lipoproteins and cholesterol; can lead to atherosclerosis at an early age | - |
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| hyperlipoproteinemia | (noun) any of various disorders of lipoprotein and cholesterol metabolism that result in high levels of lipoprotein and cholesterol in the circulating blood | - |
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| hypermastigote | (noun) flagellate symbiotic in the intestines of e.g. termites | - |
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| hypermotility | (noun) excessive movement; especially excessive motility of the gastrointestinal tract | - |
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| hypnotherapy | (noun) the use of hypnosis in psychotherapy | - |
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| hypnotic | (adjective) of or relating to hypnosis | - |
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| (adjective) attracting and holding interest as if by a spell | Synonyms: mesmeric, mesmerizing, spellbinding |
| (noun) a drug that induces sleep | Synonyms: soporific |
| hypnotically | (adverb) by means of hypnotism | - |
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| hypnotise | (verb) induce hypnosis in | Synonyms: hypnotize, mesmerise, mesmerize |
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| hypnotised | (adjective) having your attention fixated as though by a spell | Synonyms: fascinated, hypnotized, mesmerised, mesmerized, spell-bound, spellbound, transfixed |
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| hypnotiser | (noun) a person who induces hypnosis | Synonyms: hypnotist, hypnotizer, mesmerist, mesmerizer |
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| hypnotism | (noun) the act of inducing hypnosis | Synonyms: mesmerism, suggestion |
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| hypnotist | (noun) a person who induces hypnosis | Synonyms: hypnotiser, hypnotizer, mesmerist, mesmerizer |
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| hypnotize | (verb) induce hypnosis in | Synonyms: hypnotise, mesmerise, mesmerize |
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| hypnotized | (adjective) having your attention fixated as though by a spell | Synonyms: fascinated, hypnotised, mesmerised, mesmerized, spell-bound, spellbound, transfixed |
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| hypnotizer | (noun) a person who induces hypnosis | Synonyms: hypnotiser, hypnotist, mesmerist, mesmerizer |
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| hypobetalipoproteinemia | (noun) a hereditary disorder characterized by low levels of beta-lipoproteins and lipids and cholesterol | - |
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| hypolipoproteinemia | (noun) any of various disorders of lipoprotein and cholesterol metabolism that result in low levels of lipoprotein and cholesterol in the circulating blood | - |
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| hypoproteinemia | (noun) abnormally low level of protein in the blood; can indicate inadequate diet or intestinal or renal disorders | - |
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| hypotension | (noun) abnormally low blood pressure | - |
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| hypotensive | (adjective) having abnormally low blood pressure | - |
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| (noun) a person who has abnormally low blood pressure | - |
| hypotenuse | (noun) the side of a right triangle opposite the right angle | - |
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| hypothalamic | (adjective) of or relating to the hypothalamus | - |
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| hypothalamically | (adverb) with respect to the hypothalamus | - |
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| hypothalamus | (noun) a basal part of the diencephalon governing autonomic nervous system | - |
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| hypothecate | (verb) to believe especially on uncertain or tentative grounds | Synonyms: conjecture, hypothesise, hypothesize, speculate, suppose, theorise, theorize |
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| (verb) pledge without delivery or title of possession | - |
| hypothermia | (noun) subnormal body temperature | - |
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| hypothermic | (adjective) of or relating to or affected by hypothermia | - |
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| hypothesis | (noun) a tentative insight into the natural world; a concept that is not yet verified but that if true would explain certain facts or phenomena | Synonyms: possibility, theory |
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| (noun) a proposal intended to explain certain facts or observations | - |
| (noun) a message expressing an opinion based on incomplete evidence | Synonyms: conjecture, guess, speculation, supposition, surmisal, surmise |
| hypothesise | (verb) to believe especially on uncertain or tentative grounds | Synonyms: conjecture, hypothecate, hypothesize, speculate, suppose, theorise, theorize |
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| hypothesize | (verb) to believe especially on uncertain or tentative grounds | Synonyms: conjecture, hypothecate, hypothesise, speculate, suppose, theorise, theorize |
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| hypothetic | (adjective) based primarily on surmise rather than adequate evidence | Synonyms: conjectural, divinatory, hypothetical, supposed, suppositional, suppositious, supposititious |
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| hypothetical | (adjective) based primarily on surmise rather than adequate evidence | Synonyms: conjectural, divinatory, hypothetic, supposed, suppositional, suppositious, supposititious |
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| (noun) a hypothetical possibility, circumstance, statement, proposal, situation, etc. | - |
| hypothetically | (adverb) by hypothesis | - |
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| hypothrombinemia | (noun) a low level of prothrombin (factor II) in the circulating blood; results in long clotting time and poor clot formation and sometimes excessive bleeding; can result from vitamin K deficiency | - |
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| hypothyroidism | (noun) an underactive thyroid gland; a glandular disorder resulting from insufficient production of thyroid hormones | - |
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| hypotonia | (noun) (of muscular tissue) the state of being hypotonic | Synonyms: hypotonicity, hypotonus |
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| hypotonic | (adjective) (of a solution) having a lower osmotic pressure than a comparison solution | - |
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| (adjective) (of living tissue) lacking normal tone or tension | - |
| hypotonicity | (noun) (of muscular tissue) the state of being hypotonic | Synonyms: hypotonia, hypotonus |
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| (noun) (of a solution) the extent to which a solution has a lower osmotic pressure than some other | - |
| hypotonus | (noun) (of muscular tissue) the state of being hypotonic | Synonyms: hypotonia, hypotonicity |
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| hypotyposis | (noun) vivid picturesque description. | - |
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| hysterotomy | (noun) surgical incision into the uterus (as in cesarean section) | - |
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| idempotent | (adjective) unchanged in value following multiplication by itself | - |
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| idiot | (noun) a person of subnormal intelligence | Synonyms: changeling, cretin, half-wit, imbecile, moron, retard |
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| idiotic | (adjective) so unreasonable as to invite derision | Synonyms: absurd, cockeyed, derisory, laughable, ludicrous, nonsensical, preposterous, ridiculous |
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| (adjective) insanely irresponsible | Synonyms: crackbrained |
| (adjective) having a mental age of three to seven years | Synonyms: imbecile, imbecilic |