| thug | (noun) an aggressive and violent young criminal | Synonyms: goon, hood, hoodlum, punk, strong-armer, tough, toughie |
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| (verb) Acting like a criminal or antisocially but with positive connotations | - |
| thuggee | (noun) murder and robbery by thugs | - |
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| thuggery | (noun) violent or brutal acts as of thugs | - |
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| thulium | (noun) a soft silvery metallic element of the rare earth group; isotope 170 emits X-rays and is used in small portable X-ray machines; it occurs in monazite and apatite and xenotime | Synonyms: atomic number 69, Tm |
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| thumb | (noun) the part of a glove that provides a covering for the thumb | - |
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| (noun) a convex molding having a cross section in the form of a quarter of a circle or of an ellipse | Synonyms: ovolo, quarter round |
| (noun) the thick short innermost digit of the forelimb | Synonyms: pollex |
| (verb) feel or handle with the fingers | Synonyms: finger |
| (verb) travel by getting free rides from motorists | Synonyms: hitch, hitchhike |
| (verb) look through a book or other written material | Synonyms: flick, flip, leaf, riff, riffle |
| thumbed | (adjective) (of pages) worn or soiled by thumb and fingers by frequent handling or turning | - |
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| thumbhole | (noun) a finger hole made to fit the thumb (as in a bowling ball) | - |
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| (noun) the hole in a woodwind that is closed and opened with the thumb | - |
| thumbnail | (noun) the nail of the thumb | - |
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| thumbnut | (noun) a threaded nut with winglike projections for thumb and forefinger leverage in turning | Synonyms: butterfly nut, wing-nut, wing nut, wing screw |
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| thumbprint | (noun) fingerprint made by the thumb (especially by the pad of the thumb) | - |
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| thumbscrew | (noun) screw designed to be turned with the thumb and fingers | - |
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| (noun) instrument of torture that crushes the thumb | - |
| thumbstall | (noun) protective covering for an injured thumb | - |
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| thumbtack | (noun) a tack for attaching papers to a bulletin board or drawing board | Synonyms: drawing pin, pushpin |
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| (verb) fasten with thumbtacks | - |
| thump | (noun) a heavy blow with the hand | - |
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| (noun) a heavy dull sound (as made by impact of heavy objects) | Synonyms: clump, clunk, thud, thumping |
| (verb) hit hard with the hand, fist, or some heavy instrument | Synonyms: poke, pound |
| (verb) move rhythmically | Synonyms: beat, pound |
| (verb) make a dull sound | Synonyms: thud |
| thumping | (adjective) (used informally) very large | Synonyms: banging, humongous, walloping, whopping |
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| (noun) a heavy dull sound (as made by impact of heavy objects) | Synonyms: clump, clunk, thud, thump |
| thunder | (noun) street names for heroin | Synonyms: big H, hell dust, nose drops, scag, skag, smack |
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| (noun) a deep prolonged loud noise | Synonyms: boom, roar, roaring |
| (noun) a booming or crashing noise caused by air expanding along the path of a bolt of lightning | - |
| (verb) utter words loudly and forcefully | Synonyms: roar |
| (verb) to make or produce a loud noise | - |
| (verb) move fast, noisily, and heavily | - |
| (verb) be the case that thunder is being heard | Synonyms: boom |
| thunderbird | (noun) (mythology) the spirit of thunder and lightning believed by some Native Americans to take the shape of a great bird | - |
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| thunderbolt | (noun) a shocking surprise | Synonyms: bombshell, thunderclap |
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| (noun) a discharge of lightning accompanied by thunder | Synonyms: bolt, bolt of lightning |
| thunderclap | (noun) a single sharp crash of thunder | - |
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| (noun) a shocking surprise | Synonyms: bombshell, thunderbolt |
| thundercloud | (noun) a dark cloud of great vertical extent charged with electricity; associated with thunderstorms | Synonyms: cumulonimbus, cumulonimbus cloud |
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| thunderer | (noun) a noisemaker that makes a sound like thunder | - |
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| thunderhead | (noun) a rounded projecting mass of a cumulus cloud with shining edges; often appears before a thunderstorm | - |
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| thundering | (adjective) extraordinarily big or impressive | - |
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| (adjective) sounding like thunder | - |
| thunderous | (adjective) loud enough to cause (temporary) hearing loss | Synonyms: deafening, earsplitting, thundery |
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| (adjective) extremely ominous | - |
| thunderousness | (noun) The state or condition of being very loud, suggestive of thunder; booming loudness. | - |
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| thundershower | (noun) a short rainstorm accompanied by thunder and lightning | - |
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| thunderstorm | (noun) a storm resulting from strong rising air currents; heavy rain or hail along with thunder and lightning | Synonyms: electric storm, electrical storm |
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| thunderstruck | (adjective) as if struck dumb with astonishment and surprise | Synonyms: dumbfounded, dumbstricken, dumbstruck, dumfounded, flabbergasted, stupefied |
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| thundery | (adjective) loud enough to cause (temporary) hearing loss | Synonyms: deafening, earsplitting, thunderous |
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| (adjective) accompanied with thunder | - |
| thunk | (noun) a dull hollow sound | - |
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| thurible | (noun) a container for burning incense (especially one that is swung on a chain in a religious ritual) | Synonyms: censer |
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| thurifer | (noun) an acolyte who carries a thurible | - |
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| thurify | (verb) perfume especially with a censer | Synonyms: cense, incense |
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| thus | (noun) an aromatic gum resin obtained from various Arabian or East African trees; formerly valued for worship and for embalming and fumigation | Synonyms: frankincense, gum olibanum, olibanum |
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| (adverb) (used to introduce a logical conclusion) from that fact or reason or as a result | Synonyms: hence, so, thence, therefore |
| (adverb) in the way indicated | Synonyms: so, thusly |
| thusly | (adverb) in the way indicated | Synonyms: so, thus |
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| thwack | (noun) a hard blow with a flat object | - |
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| (verb) deliver a hard blow to | Synonyms: smack |
| thwart | (noun) a crosspiece spreading the gunnels of a boat; used as a seat in a rowboat | Synonyms: cross thwart |
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| (verb) hinder or prevent (the efforts, plans, or desires) of | Synonyms: baffle, bilk, cross, foil, frustrate, queer, scotch, spoil |
| thwarted | (adjective) disappointingly unsuccessful | Synonyms: defeated, disappointed, discomfited, foiled, frustrated |
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| thwarter | (noun) someone who systematically obstructs some action that others want to take | Synonyms: obstructer, obstructionist, obstructor, resister |
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| thwarting | (adjective) preventing realization or attainment of a desire | Synonyms: frustrating, frustrative |
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| (noun) an act of hindering someone's plans or efforts | Synonyms: foiling, frustration |
| thwartwise | (adjective) extending or lying across; in a crosswise direction; at right angles to the long axis | Synonyms: cross, transversal, transverse |
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| thylacine | (noun) rare doglike carnivorous marsupial of Tasmania having stripes on its back; probably extinct | Synonyms: Tasmanian tiger, Tasmanian wolf, Thylacinus cynocephalus |
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| thyme | (noun) leaves can be used as seasoning for almost any meat and stews and stuffings and vegetables | - |
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| (noun) any of various mints of the genus Thymus | - |
| thymidine | (noun) a nucleoside component of DNA; composed of thymine and deoxyribose | Synonyms: deoxythymidine |
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| thymine | (noun) a base found in DNA (but not in RNA) and derived from pyrimidine; pairs with adenine | Synonyms: T |
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| thymol | (noun) a colorless crystalline solid used in perfume or preserving biological specimens or in embalming or medically as a fungicide or antiseptic | Synonyms: thyme camphor, thymic acid |
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| thymosin | (noun) hormone secreted by the thymus; stimulates immunological activity of lymphoid tissue | - |
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| thymus | (noun) a ductless glandular organ at the base of the neck that produces lymphocytes and aids in producing immunity; atrophies with age | Synonyms: thymus gland |
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| thyreophoran | (noun) armored dinosaurs: stegosaurs and ankylosaurs | Synonyms: suborder Thyreophora, Thyreophora |
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| thyrocalcitonin | (noun) thyroid hormone that tends to lower the level of calcium in the blood plasma and inhibit resorption of bone | Synonyms: calcitonin |
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| thyroglobulin | (noun) an iodine containing protein that is obtained from the thyroid gland and exhibits the general properties of the globulins | - |
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| thyroid | (adjective) suggestive of a thyroid disorder | - |
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| (adjective) of or relating to the thyroid gland | Synonyms: thyroidal |
| (noun) located near the base of the neck | Synonyms: thyroid gland |
| thyroidal | (adjective) of or relating to the thyroid gland | Synonyms: thyroid |
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| thyroidectomy | (noun) surgical removal of the thyroid gland | - |
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| thyroiditis | (noun) inflammation of the thyroid gland | - |
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| thyromegaly | (noun) abnormally enlarged thyroid gland; can result from underproduction or overproduction of hormone or from a deficiency of iodine in the diet | Synonyms: goiter, goitre, struma |
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| thyronine | (noun) a phenolic amino acid of which thyroxine is a derivative | - |
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| thyroprotein | (noun) a preparation made from iodinated protein and having an action similar to thyroxine | - |
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| thyrotoxic | (adjective) of or relating to or affected by hyperthyroidism | - |
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| thyrotoxicosis | (noun) an overactive thyroid gland; pathologically excessive production of thyroid hormones or the condition resulting from excessive production of thyroid hormones | Synonyms: hyperthyroidism |
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| thyrotrophin | (noun) anterior pituitary hormone that stimulates the function of the thyroid gland | Synonyms: thyroid-stimulating hormone, thyrotrophic hormone, thyrotropic hormone, thyrotropin, TSH |
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| thyrotropin | (noun) anterior pituitary hormone that stimulates the function of the thyroid gland | Synonyms: thyroid-stimulating hormone, thyrotrophic hormone, thyrotrophin, thyrotropic hormone, TSH |
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| thyroxin | (noun) hormone produced by the thyroid glands to regulate metabolism by controlling the rate of oxidation in cells | Synonyms: T, tetraiodothyronine, thyroxine |
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| thyroxine | (noun) hormone produced by the thyroid glands to regulate metabolism by controlling the rate of oxidation in cells | Synonyms: T, tetraiodothyronine, thyroxin |
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| thyrse | (noun) a dense flower cluster (as of the lilac or horse chestnut) in which the main axis is racemose and the branches are cymose | Synonyms: thyrsus |
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| thyrsopteris | (noun) a terrestrial tree fern of South America | Synonyms: Thyrsopteris elegans |
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| thyrsus | (noun) a dense flower cluster (as of the lilac or horse chestnut) in which the main axis is racemose and the branches are cymose | Synonyms: thyrse |
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| thysanopter | (noun) an insect of the order Thysanoptera | Synonyms: thysanopteron, thysanopterous insect |
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| thysanopteron | (noun) an insect of the order Thysanoptera | Synonyms: thysanopter, thysanopterous insect |
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| thysanuron | (noun) primitive wingless insects: bristletail | Synonyms: thysanuran insect |
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