| 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 |
| trimmings | (noun) the accessories that normally accompany (something or some activity) | Synonyms: fixings |
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| trimness | (noun) a state of arrangement or appearance | Synonyms: trim |
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| trimotored | (adjective) having three motors | - |
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| trine | (noun) the cardinal number that is the sum of one and one and one | Synonyms: 3, deuce-ace, III, leash, tercet, ternary, ternion, terzetto, three, threesome, tierce, trey, triad, trinity, trio, triplet, troika |
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| trinitroglycerin | (noun) a heavy yellow poisonous oily explosive liquid obtained by nitrating glycerol; used in making explosives and medically as a vasodilator (trade names Nitrospan and Nitrostat) | Synonyms: glyceryl trinitrate, nitroglycerin, nitroglycerine, Nitrospan, Nitrostat |
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| trinitrotoluene | (noun) explosive consisting of a yellow crystalline compound that is a flammable toxic derivative of toluene | Synonyms: TNT |
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| trinity | (noun) three people considered as a unit | Synonyms: threesome, triad, trio |
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| (noun) the cardinal number that is the sum of one and one and one | Synonyms: 3, deuce-ace, III, leash, tercet, ternary, ternion, terzetto, three, threesome, tierce, trey, triad, trine, trio, triplet, troika |
| trinket | (noun) cheap showy jewelry or ornament on clothing | Synonyms: bangle, bauble, fallal, gaud, gewgaw, novelty |
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| trinketry | (noun) trinkets and other ornaments of dress collectively | - |
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| trinuclear | (adjective) having three nuclei | Synonyms: trinucleate, trinucleated |
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| trinucleate | (adjective) having three nuclei | Synonyms: trinuclear, trinucleated |
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| trinucleated | (adjective) having three nuclei | Synonyms: trinuclear, trinucleate |
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| trio | (noun) a musical composition for three performers | - |
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| (noun) three people considered as a unit | Synonyms: threesome, triad, trinity |
| (noun) a set of three similar things considered as a unit | Synonyms: triad, triple, triplet |
| (noun) three performers or singers who perform together | - |
| (noun) the cardinal number that is the sum of one and one and one | Synonyms: 3, deuce-ace, III, leash, tercet, ternary, ternion, terzetto, three, threesome, tierce, trey, triad, trine, trinity, triplet, troika |
| triode | (noun) a thermionic vacuum tube having three electrodes; fluctuations of the charge on the grid control the flow from cathode to anode which makes amplification possible | - |
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| triolein | (noun) a naturally occurring glyceride of oleic acid that is found in fats and oils | Synonyms: olein |
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| triose | (noun) any monosaccharide sugar containing three atoms of carbon per molecule | - |
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| trioxide | (noun) an oxide containing three atoms of oxygen in the molecule | - |
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| trip | (noun) a journey for some purpose (usually including the return) | - |
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| (noun) an unintentional but embarrassing blunder | Synonyms: misstep, stumble, trip-up |
| (noun) a light or nimble tread | - |
| (noun) a catch mechanism that acts as a switch | Synonyms: tripper |
| (noun) an accidental misstep threatening (or causing) a fall | Synonyms: slip |
| (noun) an exciting or stimulating experience | Synonyms: head trip |
| (noun) a hallucinatory experience induced by drugs | - |
| (verb) get high, stoned, or drugged | Synonyms: get off, trip out, turn on |
| (verb) put in motion or move to act | Synonyms: activate, actuate, set off, spark, spark off, touch off, trigger, trigger off |
| (verb) miss a step and fall or nearly fall | Synonyms: stumble |
| (verb) cause to stumble | Synonyms: trip up |
| (verb) make a trip for pleasure | Synonyms: jaunt, travel |
| tripalmitin | (noun) a triglyceride of palmitic acid | Synonyms: glycerol tripalmitate |
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| tripartite | (adjective) involving three parties or elements | Synonyms: three-party, three-way |
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| tripe | (noun) nonsensical talk or writing | Synonyms: applesauce, codswallop, folderol, rubbish, trash, trumpery, wish-wash |
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| (noun) lining of the stomach of a ruminant (especially a bovine) used as food | - |
| triphammer | (noun) a massive power hammer; raised by a cam until released to fall under gravity | - |
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| triphosphopyridine | (noun) a pyridine ring with three phosphorus groups | - |
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| tripinnate | (adjective) (of a leaf shape) thrice pinnate | Synonyms: tripinnated |
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| tripinnated | (adjective) (of a leaf shape) thrice pinnate | Synonyms: tripinnate |
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| tripinnatifid | (adjective) (of a leaf shape) bipinnatifid with segments pinnatifid | - |
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| triple | (adjective) having three units or components or elements | Synonyms: ternary, treble, triplex |
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| (adjective) three times as great or many | Synonyms: three-fold, threefold, treble |
| (noun) a base hit at which the batter stops safely at third base | Synonyms: three-bagger, three-base hit |
| (noun) a quantity that is three times as great as another | - |
| (noun) a set of three similar things considered as a unit | Synonyms: triad, trio, triplet |
| (verb) increase threefold | Synonyms: treble |
| (verb) hit a three-base hit | - |
| triplet | (noun) a set of three similar things considered as a unit | Synonyms: triad, trio, triple |
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| (noun) one of three offspring born at the same time from the same pregnancy | - |
| (noun) the cardinal number that is the sum of one and one and one | Synonyms: 3, deuce-ace, III, leash, tercet, ternary, ternion, terzetto, three, threesome, tierce, trey, triad, trine, trinity, trio, troika |
| tripletail | (noun) large food fish of warm waters worldwide having long anal and dorsal fins that with a caudal fin suggest a three-lobed tail | - |
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| triplex | (adjective) having three units or components or elements | Synonyms: ternary, treble, triple |
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| triplicate | (noun) one of three copies; any of three things that correspond to one another exactly | - |
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| (verb) reproduce threefold | - |
| triplicity | (noun) the property of being triple | - |
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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: trigon |
| tripling | (noun) increase by a factor of three | - |
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| triploid | (adjective) of a cell or organism having three complete sets of chromosomes | - |
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| tripod | (noun) a three-legged rack used for support | - |
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| tripoli | (noun) a weathered and decomposed siliceous limestone; in powdered form it is used in polishing | Synonyms: rottenstone |
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| tripos | (noun) final honors degree examinations at Cambridge University | - |
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