| tricentennial | (adjective) of or relating to or completing a period of 300 years | Synonyms: tricentenary |
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| triceps | (noun) any skeletal muscle having three origins (but especially the triceps brachii) | - |
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| triceratops | (noun) huge ceratopsian dinosaur having three horns and the neck heavily armored with a very solid frill | - |
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| trichina | (noun) parasitic nematode occurring in the intestines of pigs and rats and human beings and producing larvae that form cysts in skeletal muscles | Synonyms: Trichinella spiralis |
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| trichiniasis | (noun) infestation by trichina larvae that are transmitted by eating inadequately cooked meat (especially pork); larvae migrate from the intestinal tract to the muscles where they become encysted | Synonyms: myositis trichinosa, trichinosis |
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| trichinosis | (noun) infestation by trichina larvae that are transmitted by eating inadequately cooked meat (especially pork); larvae migrate from the intestinal tract to the muscles where they become encysted | Synonyms: myositis trichinosa, trichiniasis |
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| trichion | (noun) point where the hairline meets the midpoint of the forehead | Synonyms: crinion |
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| trichloride | (noun) any compound containing three chlorine atoms in each molecule | - |
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| trichlormethiazide | (noun) diuretic drug (trade name Naqua) used to treat hypertension | Synonyms: Naqua |
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| trichloroethane | (noun) a heavy colorless highly toxic liquid used as a solvent to clean electronic components and for dry cleaning and as a fumigant; causes cancer and liver and lung damage | Synonyms: TCE, trichloroethylene |
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| trichloroethylene | (noun) a heavy colorless highly toxic liquid used as a solvent to clean electronic components and for dry cleaning and as a fumigant; causes cancer and liver and lung damage | Synonyms: TCE, trichloroethane |
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| trichloromethane | (noun) a volatile liquid haloform (CHCl3); formerly used as an anesthetic | Synonyms: chloroform |
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| trichobezoar | (noun) a compact mass of hair that forms in the alimentary canal (especially in the stomach of animals as a result of licking fur) | Synonyms: hair ball, hairball |
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| trichodesmium | (noun) large colonial bacterium common in tropical open-ocean waters; important in carbon and nitrogen fixation | - |
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| trichomonad | (noun) cause of trichomoniasis in women and cattle and birds | - |
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| trichomoniasis | (noun) infection of the vagina | - |
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| trichopteran | (noun) caddis fly | Synonyms: trichopteron, trichopterous insect |
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| trichopteron | (noun) caddis fly | Synonyms: trichopteran, trichopterous insect |
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| trichotillomania | (noun) an irresistible urge to pull out your own hair | - |
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| trichotomy | (noun) being threefold; a classification into three parts or subclasses | - |
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| trichroism | (noun) pleochroism of a crystal so that it exhibits three different colors when viewed from three different directions | - |
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| trichromacy | (noun) the normal ability to see colors | Synonyms: chromatic vision, color vision |
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| trichromatic | (adjective) having or involving three colors | Synonyms: trichrome, tricolor |
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| trichrome | (adjective) having or involving three colors | Synonyms: trichromatic, tricolor |
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| trichuriasis | (noun) infestation by a roundworm; common in tropical areas with poor sanitation | - |
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| trick | (noun) a ludicrous or grotesque act done for fun and amusement | Synonyms: antic, caper, joke, prank, put-on |
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| (noun) (card games) in a single round, the sequence of cards played by all the players; the high card is the winner | - |
| (noun) an illusory feat; considered magical by naive observers | Synonyms: conjuration, conjuring trick, deception, illusion, legerdemain, magic, magic trick, thaumaturgy |
| (noun) an attempt to get you to do something foolish or imprudent | - |
| (noun) a cunning or deceitful action or device | Synonyms: fast one |
| (noun) a prostitute's customer | Synonyms: john, whoremaster, whoremonger |
| (noun) a period of work or duty | - |
| (verb) deceive somebody | Synonyms: flim-flam, fob, fox, play a joke on, play a trick on, play tricks, pull a fast one on |
| tricker | (noun) someone who plays practical jokes on others | Synonyms: cut-up, hoaxer, practical joker, prankster, trickster |
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| trickery | (noun) the use of tricks to deceive someone (usually to extract money from them) | Synonyms: chicane, chicanery, guile, shenanigan, wile |
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| (noun) verbal misrepresentation intended to take advantage of you in some way | Synonyms: hanky panky, hocus-pocus, jiggery-pokery, skulduggery, skullduggery, slickness |
| trickily | (adverb) in an subtle, cunning manner | Synonyms: artfully, craftily, cunningly, foxily, knavishly, slyly |
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| trickiness | (noun) the quality of being a slippery rascal | Synonyms: rascality, shiftiness, slipperiness |
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| (noun) the quality of requiring skill or caution | - |
| trickle | (noun) flowing in drops; the formation and falling of drops of liquid | Synonyms: dribble, drip |
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| (verb) run or flow slowly, as in drops or in an unsteady stream | Synonyms: dribble, filter |
| trickster | (noun) someone who plays practical jokes on others | Synonyms: cut-up, hoaxer, practical joker, prankster, tricker |
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| (noun) someone who leads you to believe something that is not true | Synonyms: beguiler, cheat, cheater, deceiver, slicker |
| (noun) a mischievous supernatural being found in the folklore of many primitive people; sometimes distinguished by prodigious biological drives and exaggerated bodily parts | - |
| tricksy | (adjective) marked by skill in deception | Synonyms: crafty, cunning, dodgy, foxy, guileful, knavish, slick, sly, tricky, wily |
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| tricky | (adjective) marked by skill in deception | Synonyms: crafty, cunning, dodgy, foxy, guileful, knavish, slick, sly, tricksy, wily |
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| (adjective) having concealed difficulty | Synonyms: catchy |
| (adjective) not to be trusted | Synonyms: slippery |
| triclinic | (adjective) having three unequal crystal axes intersecting at oblique angles | Synonyms: anorthic |
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| triclinium | (noun) a dining table with couches along three sides in ancient Rome | - |
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| (noun) a dining room (especially a dining room containing a dining table with couches along three sides) | - |
| tricolor | (adjective) having or involving three colors | Synonyms: trichromatic, trichrome |
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| (noun) a flag having three colored stripes (especially the French flag) | Synonyms: tricolour |
| tricolour | (noun) a flag having three colored stripes (especially the French flag) | Synonyms: tricolor |
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| tricorn | (noun) cocked hat with the brim turned up to form three points | Synonyms: tricorne |
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| tricorne | (noun) cocked hat with the brim turned up to form three points | Synonyms: tricorn |
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| tricot | (noun) a knitted fabric or one resembling knitting | - |
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| tricuspid | (adjective) having three cusps or points (especially a molar tooth) | Synonyms: tricuspidate |
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| tricuspidate | (adjective) having three cusps or points (especially a molar tooth) | Synonyms: tricuspid |
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| tricycle | (noun) a vehicle with three wheels that is moved by foot pedals | Synonyms: trike, velocipede |
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| tricyclic | (noun) an antidepressant drug that acts by blocking the reuptake of norepinephrine and serotonin and thus making more of those substances available to act on receptors in the brain | Synonyms: tricyclic antidepressant, tricyclic antidepressant drug |
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| trident | (noun) a spear with three prongs | - |
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| tridymite | (noun) a mineral form of silica | - |
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| tried | (adjective) tested and proved useful or correct | Synonyms: tested, well-tried |
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| (adjective) tested and proved to be reliable | Synonyms: tested, time-tested, tried and true |
| triennial | (adjective) occurring every third year or lasting 3 years | - |
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| (noun) the 300th anniversary (or the celebration of it) | Synonyms: tercentenary, tercentennial |
| trier | (noun) one who tries | Synonyms: attempter, essayer |
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| (noun) one (as a judge) who examines and settles a case | - |
| trifid | (adjective) divided into three lobes | - |
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| trifle | (noun) something of small importance | Synonyms: small beer, trivia, triviality |
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| (noun) a detail that is considered insignificant | Synonyms: triviality |
| (noun) a cold pudding made of layers of sponge cake spread with fruit or jelly; may be decorated with nuts, cream, or chocolate | - |
| (verb) consider not very seriously | Synonyms: dally, play |
| (verb) act frivolously | Synonyms: frivol |
| (verb) waste time; spend one's time idly or inefficiently | Synonyms: piddle, piddle away, wanton, wanton away |
| trifler | (noun) one who behaves lightly or not seriously | - |
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| trifling | (adjective) not worth considering | Synonyms: negligible, paltry |
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| (noun) the deliberate act of delaying and playing instead of working | Synonyms: dalliance, dawdling |
| trifluoromethane | (noun) colorless gas haloform CHF3 (similar to chloroform) | Synonyms: fluoroform |
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| trifoliata | (noun) small fast-growing spiny deciduous Chinese orange tree bearing sweetly scented flowers and decorative but inedible fruit: used as a stock in grafting and for hedges | Synonyms: Poncirus trifoliata, trifoliate orange, wild orange |
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| trifoliate | (adjective) (of a leaf shape) having three leaflets | Synonyms: trifoliated, trifoliolate |
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| trifoliated | (adjective) (of a leaf shape) having three leaflets | Synonyms: trifoliate, trifoliolate |
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| trifoliolate | (adjective) (of a leaf shape) having three leaflets | Synonyms: trifoliate, trifoliated |
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| trifurcate | (verb) divide into three | - |
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| trifurcation | (noun) the act of splitting into three branches | - |
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| trig | (adjective) neat and smart in appearance | Synonyms: clean-cut, trim |
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| (noun) the mathematics of triangles and trigonometric functions | Synonyms: trigonometry |
| trigeminal | (noun) the main sensory nerve of the face and motor nerve for the muscles of mastication | Synonyms: fifth cranial nerve, nervus trigeminus, trigeminal nerve, trigeminus |
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| trigeminus | (noun) the main sensory nerve of the face and motor nerve for the muscles of mastication | Synonyms: fifth cranial nerve, nervus trigeminus, trigeminal, trigeminal nerve |
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| trigger | (noun) an act that sets in motion some course of events | Synonyms: induction, initiation |
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| (noun) lever that activates the firing mechanism of a gun | Synonyms: gun trigger |
| (noun) a device that activates or releases or causes something to happen | - |
| (verb) release or pull the trigger on | - |
| (verb) put in motion or move to act | Synonyms: activate, actuate, set off, spark, spark off, touch off, trigger off, trip |
| triggerfish | (noun) any of numerous compressed deep-bodied tropical fishes with sandpapery skin and erectile spines in the first dorsal fin | - |
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| triggerman | (noun) a professional killer who uses a gun | Synonyms: gun, gun for hire, gunman, gunslinger, hired gun, hit man, hitman, shooter, torpedo |
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| triglyceride | (noun) glyceride occurring naturally in animal and vegetable tissues; it consists of three individual fatty acids bound together in a single large molecule; an important energy source forming much of the fat stored by the body | - |
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| trigon | (noun) a triangular lyre of ancient Greece and Rome | - |
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| (noun) (astrology) one of four groups of the zodiac where each group consists of three signs separated from each other by 120 degrees | Synonyms: triplicity |
| (noun) a three-sided polygon | Synonyms: triangle, trilateral |
| trigonal | (adjective) having threefold symmetry | Synonyms: rhombohedral |
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| trigonometric | (adjective) of or relating to or according to the principles of trigonometry | - |
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| trigonometrician | (noun) a mathematician specializing in trigonometry | - |
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| trigonometry | (noun) the mathematics of triangles and trigonometric functions | Synonyms: trig |
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| trigram | (noun) a word that is written with three letters in an alphabetic writing system | - |
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| trihydroxy | (adjective) containing three hydroxyl groups | - |
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| triiodomethane | (noun) a yellowish crystalline solid with a penetrating odor; sometimes used as an antiseptic dressing | Synonyms: iodoform |
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| triiodothyronine | (noun) thyroid hormone similar to thyroxine but with one less iodine atom per molecule and produced in smaller quantity; exerts the same biological effects as thyroxine but is more potent and briefer | Synonyms: liothyronine, T |
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| trike | (noun) a vehicle with three wheels that is moved by foot pedals | Synonyms: tricycle, velocipede |
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| trilateral | (adjective) having three sides | Synonyms: three-sided, triangular |
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| (adjective) involving three parties | - |
| (noun) a three-sided polygon | Synonyms: triangle, trigon |
| trilby | (noun) a hat made of felt with a creased crown | Synonyms: fedora, felt hat, homburg, Stetson |
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| trilingual | (adjective) using or knowing three languages | - |
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| trill | (noun) a note that alternates rapidly with another note a semitone above it | Synonyms: shake |
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| (noun) the articulation of a consonant (especially the consonant `r') with a rapid flutter of the tongue against the palate or uvula | - |
| (verb) sing or play with trills, alternating with the half note above or below | Synonyms: quaver, warble |
| (verb) pronounce with a trill, of the phoneme `r' | - |
| trilled | (adjective) uttered with a trill | Synonyms: rolled, rolling |
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| trillion | (adjective) one million million in the United States | - |
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| (adjective) one quintillion in Great Britain | - |
| (noun) the number that is represented as a one followed by 12 zeros | Synonyms: 1000000000000, one million million |
| (noun) the number that is represented as a one followed by 18 zeros in the UK | Synonyms: one million million million |
| (noun) a very large indefinite number (usually hyperbole) | Synonyms: bazillion, billion, gazillion, jillion, million, zillion |
| trillionth | (adjective) the ordinal number of one trillion in counting order | - |
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| (noun) one part in a trillion equal parts | Synonyms: one-trillionth |
| trillium | (noun) any liliaceous plant of the genus Trillium having a whorl of three leaves at the top of the stem with a single three-petaled flower | Synonyms: wake-robin, wood lily |
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| trilobate | (adjective) (of a leaf shape) divided into three lobes | Synonyms: three-lobed, trilobated, trilobed |
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| trilobated | (adjective) (of a leaf shape) divided into three lobes | Synonyms: three-lobed, trilobate, trilobed |
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| trilobed | (adjective) (of a leaf shape) divided into three lobes | Synonyms: three-lobed, trilobate, trilobated |
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| trilobite | (noun) an extinct arthropod that was abundant in Paleozoic times; had an exoskeleton divided into three parts | - |
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| trilogy | (noun) a set of three literary or dramatic works related in subject or theme | - |
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| trim | (adjective) severely simple in line or design | Synonyms: tailored |
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| (adjective) thin and fit | Synonyms: spare |
| (adjective) characterized by order and neatness; free from disorder | Synonyms: shipshape, well-kept |
| (adjective) neat and smart in appearance | Synonyms: clean-cut, trig |
| (noun) cutting down to the desired size or shape | Synonyms: clipping, trimming |
| (noun) a decoration or adornment typically on the edge of a garment | Synonyms: passementerie, trimming |
| (noun) attitude of an aircraft in flight when allowed to take its own orientation | - |
| (noun) a state of arrangement or appearance | Synonyms: trimness |
| (verb) cut down on; make a reduction in | Synonyms: bring down, cut, cut back, cut down, reduce, trim back, trim down |
| (verb) adjust (sails on a ship) so that the wind is optimally used | - |
| (verb) cut closely | Synonyms: shave |
| (verb) cultivate, tend, and cut back the growth of | Synonyms: clip, crop, cut back, dress, lop, prune, snip |
| (verb) remove the edges from and cut down to the desired size | Synonyms: pare |
| (verb) decorate (food), as with parsley or other ornamental foods | Synonyms: dress, garnish |
| (verb) decorate, as with ornaments | - |
| (verb) be in equilibrium during a flight | - |
| (verb) balance in flight by regulating the control surfaces | - |
| trimaran | (noun) a fast sailboat with 3 parallel hulls | - |
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| trimer | (noun) a polymer (or a molecule of a polymer) consisting of three identical monomers | - |
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| trimester | (noun) a period of three months; especially one of the three three-month periods into which human pregnancy is divided | - |
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| (noun) one of three divisions of an academic year | - |
| trimipramine | (noun) tricyclic antidepressant drug (trade name Surmontil) used to treat depression and anxiety and (sometimes) insomnia | Synonyms: Surmontil |
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| trimly | (adverb) in a trim manner | - |
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| trimmed | (adjective) made neat and tidy by trimming | Synonyms: cut |
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| trimmer | (noun) joist that receives the end of a header in floor or roof framing in order to leave an opening for a staircase or chimney etc. | Synonyms: trimmer joist |
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| (noun) capacitor having variable capacitance; used for making fine adjustments | Synonyms: trimming capacitor |
| (noun) a machine that trims timber | - |
| (noun) a worker who thins out and trims trees and shrubs | Synonyms: pruner |
| trimming | (noun) the act of adding decoration | - |
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| (noun) cutting down to the desired size or shape | Synonyms: clipping, trim |
| (noun) a decoration or adornment typically on the edge of a garment | Synonyms: passementerie, trim |