| 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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| 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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| 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 |
| 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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| 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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| 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 | (noun) a drug that induces sleep | Synonyms: soporific |
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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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| 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 | (noun) a person who has abnormally low blood pressure | - |
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| hypotenuse | (noun) the side of a right triangle opposite the right angle | - |
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| hypothalamus | (noun) a basal part of the diencephalon governing autonomic nervous system | - |
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| hypothermia | (noun) subnormal body temperature | - |
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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 |
| hypothetical | (noun) a hypothetical possibility, circumstance, statement, proposal, situation, etc. | - |
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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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| 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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| idiot | (noun) a person of subnormal intelligence | Synonyms: changeling, cretin, half-wit, imbecile, moron, retard |
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| immotility | (noun) lacking an ability to move | - |
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| immunotherapy | (noun) therapy designed to produce immunity to a disease or to enhance resistance by the immune system | - |
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| impotence | (noun) the quality of lacking strength or power; being weak and feeble | Synonyms: impotency, powerlessness |
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| (noun) an inability (usually of the male animal) to copulate | Synonyms: impotency |
| impotency | (noun) the quality of lacking strength or power; being weak and feeble | Synonyms: impotence, powerlessness |
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| (noun) an inability (usually of the male animal) to copulate | Synonyms: impotence |
| indigotin | (noun) a blue dye obtained from plants or made synthetically | Synonyms: anil, indigo |
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| infotainment | (noun) a film or TV program presenting the facts about a person or event | Synonyms: docudrama, documentary, documentary film |
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| ingot | (noun) metal that is cast in the shape of a block for convenient handling | - |
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| inkblot | (noun) a blot made with ink | - |
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| inkpot | (noun) a bottle of ink | Synonyms: ink bottle |
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| iodoprotein | (noun) a protein that contains iodine | Synonyms: iodinated protein |
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| iodothyronine | (noun) thyronine with iodine added | - |
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| iodotyrosine | (noun) tyrosine with iodine added | - |
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| iontotherapy | (noun) therapy that uses a local electric current to introduce the ions of a medicine into the tissues | Synonyms: electromotive drug administration, EMDA, ionic medication, iontophoresis |
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| iota | (noun) the 9th letter of the Greek alphabet | - |
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| (noun) a tiny or scarcely detectable amount | Synonyms: scintilla, shred, smidge, smidgen, smidgeon, smidgin, tittle, whit |
| iridotomy | (noun) a surgical procedure that makes an incision in the iris of the eye in order to enlarge the pupil or to treat closed-angle glaucoma | - |
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| isogeotherm | (noun) an isogram connecting points of equal temperature below the surface of the earth. | - |
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| isoproterenol | (noun) drug (trade name Isuprel) used to treat bronchial asthma and to stimulate the heart | Synonyms: Isuprel |
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| isotach | (noun) a line joining points with constant wind speed. | - |
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| isothere | (noun) a line on a map linking places with the same mean summer temperature. | - |
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| isotherm | (noun) (meteorology) an isogram connecting points having the same temperature at a given time | - |
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| isothiocyanate | (noun) a family of compounds derived from horseradish and radishes and onions and mustards; source of the hotness of those plants and preparations | - |
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| isotope | (noun) one of two or more atoms with the same atomic number but with different numbers of neutrons | - |
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| isotropy | (noun) (physics) the property of being isotropic; having the same value when measured in different directions | Synonyms: symmetry |
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| jabot | (noun) a ruffle on the front of a woman's blouse or a man's shirt | - |
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| jaboticaba | (noun) tough-skinned purple grapelike tropical fruit grown in Brazil | - |
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| (noun) small evergreen tropical tree native to Brazil and West Indies but introduced into southern United States; grown in Brazil for its edible tough-skinned purple grapelike fruit that grows all along the branches | Synonyms: jaboticaba tree, Myrciaria cauliflora |
| jackboot | (noun) (19th century) a man's high tasseled boot | Synonyms: hessian, Hessian boot, Wellington, Wellington boot |
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| jackpot | (noun) the cumulative amount involved in a game (such as poker) | Synonyms: kitty, pot |
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| (noun) any outstanding award | - |
| jampot | (noun) a jar for holding jellies or preserves | Synonyms: jamjar |
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| jocote | (noun) common tropical American shrub or small tree with purplish fruit | Synonyms: mombin, mombin tree, Spondias purpurea |
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| jot | (noun) a brief (and hurriedly handwritten) note | Synonyms: jotting |
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| (noun) a slight but appreciable amount | Synonyms: hint, mite, pinch, soupcon, speck, tinge, touch |
| jotter | (noun) a small notebook for rough notes | - |
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| jotting | (noun) a brief (and hurriedly handwritten) note | Synonyms: jot |
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| karyotype | (noun) the appearance of the chromosomal makeup of a somatic cell in an individual or species (including the number and arrangement and size and structure of the chromosomes) | - |
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| kenotron | (noun) a type of vacuum tube formerly used as a high-voltage rectifier. | - |
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| keratotomy | (noun) surgical incision into the cornea | - |
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| ketotetrose | (noun) A monosaccharide that has both a ketone and four carbons. | - |
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| ketotriose | (noun) Any ketose having three carbon atoms; in reality, only dihydroxyacetone. | - |
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| keynote | (noun) a fundamental or central idea | - |
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| (noun) (music) the first note of a diatonic scale | Synonyms: tonic |
| (noun) the principal theme in a speech or literary work | - |
| kiloton | (noun) one thousand tons | - |
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| (noun) a measure of explosive power (of an atomic weapon) equal to that of 1000 tons of TNT | - |
| knot | (noun) a sandpiper that breeds in the Arctic and winters in the Southern Hemisphere | Synonyms: Calidris canutus, grayback, greyback |
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| (noun) any of various fastenings formed by looping and tying a rope (or cord) upon itself or to another rope or to another object | - |
| (noun) soft lump or unevenness in a yarn; either an imperfection or created by design | Synonyms: burl, slub |
| (noun) a tight cluster of people or things | - |
| (noun) something twisted and tight and swollen | Synonyms: gnarl |
| (noun) a hard cross-grained round piece of wood in a board where a branch emerged | - |
| (noun) (of ships and wind) a unit of speed equal to one nautical mile per hour or about 1.15 statute miles per hour | - |
| knotgrass | (noun) low-growing weedy grass with spikelets along the leaf stems | Synonyms: Paspalum distichum |
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| knothole | (noun) a hole in a board where a knot came out | - |
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| knottiness | (noun) puzzling complexity | Synonyms: complicatedness, complication, tortuousness |
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| koto | (noun) Japanese stringed instrument that resembles a zither; has a rectangular wooden sounding board and usually 13 silk strings that are plucked with the fingers | - |
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| kotow | (noun) a former Chinese custom of touching the ground with the forehead as a sign of respect or submission | Synonyms: kowtow |
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| laparotomy | (noun) surgical incision into the abdominal wall; often done to examine abdominal organs | - |
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