| constraint | (noun) the act of constraining; the threat or use of force to control the thoughts or behavior of others | - |
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| (noun) a device that retards something's motion | Synonyms: restraint |
| (noun) the state of being physically constrained | Synonyms: restraint |
| contrail | (noun) an artificial cloud created by an aircraft; caused either by condensation due to the reduction in air pressure above the wing surface or by water vapor in the engine exhaust | Synonyms: condensation trail |
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| contraindication | (noun) (medicine) a reason that makes it inadvisable to prescribe a particular drug or employ a particular procedure or treatment | - |
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| distraint | (noun) the seizure and holding of property as security for payment of a debt or satisfaction of a claim | Synonyms: distress |
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| entrails | (noun) internal organs collectively (especially those in the abdominal cavity) | Synonyms: innards, insides, viscera |
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| eyestrain | (noun) a tiredness of the eyes caused by prolonged close work by a person with an uncorrected vision problem | Synonyms: asthenopia |
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| geartrain | (noun) wheelwork consisting of a connected set of rotating gears by which force is transmitted or motion or torque is changed | Synonyms: gear, gearing, power train, train |
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| overstrain | (noun) too much strain | - |
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| portrait | (noun) any likeness of a person, in any medium | Synonyms: portrayal |
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| (noun) a word picture of a person's appearance and character | Synonyms: portraiture, portrayal |
| portraitist | (noun) a painter or drawer of portraits | Synonyms: limner, portrait painter, portrayer |
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| portraiture | (noun) the activity of making portraits | - |
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| (noun) a word picture of a person's appearance and character | Synonyms: portrait, portrayal |
| quatrain | (noun) a stanza of four lines | - |
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| restrainer | (noun) a person who directs and restrains | Synonyms: controller |
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| (noun) a chemical that is added to a photographic developer in order to retard development and reduce the amount of fog on a film | - |
| restraint | (noun) the act of controlling by restraining someone or something | - |
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| (noun) a device that retards something's motion | Synonyms: constraint |
| (noun) discipline in personal and social activities | Synonyms: control |
| (noun) lack of ornamentation | Synonyms: chasteness, simpleness, simplicity |
| (noun) a rule or condition that limits freedom | - |
| (noun) the state of being physically constrained | Synonyms: constraint |
| retraining | (noun) training for a new occupation | - |
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| semitrailer | (noun) a trailer having wheels only in the rear; the front is supported by the towing vehicle | Synonyms: semi |
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| straight | (noun) a straight segment of a roadway or racecourse | Synonyms: straightaway |
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| (noun) a poker hand with 5 consecutive cards (regardless of suit) | - |
| (noun) a person having a sexual orientation to persons of the opposite sex | Synonyms: heterosexual, heterosexual person, straight person |
| straightaway | (noun) a straight segment of a roadway or racecourse | Synonyms: straight |
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| straightedge | (noun) hand tool consisting of a flat rigid rectangular bar (metal or wood) that can be used to draw straight lines (or test their straightness) | - |
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| straightener | (noun) a device for straightening | - |
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| straightforwardness | (noun) the quality of being direct and straightforward | Synonyms: downrightness |
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| (noun) without hypocrisy | Synonyms: singleness |
| straightjacket | (noun) a garment similar to a jacket that is used to bind the arms tightly against the body as a means of restraining a violent person | Synonyms: straitjacket |
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| straightness | (noun) a sexual attraction to (or sexual relations with) persons of the opposite sex | Synonyms: heterosexualism, heterosexuality |
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| (noun) freedom from crooks or curves or bends or angles | - |
| (noun) (of hair) lack of a tendency to curl | - |
| (noun) having honest intentions | Synonyms: good faith |
| (noun) trueness of course toward a goal | Synonyms: directness |
| strain | (noun) an effortful attempt to attain a goal | Synonyms: nisus, pains, striving |
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| (noun) the act of singing | Synonyms: song |
| (noun) an intense or violent exertion | Synonyms: straining |
| (noun) the general meaning or substance of an utterance | Synonyms: tenor |
| (noun) a succession of notes forming a distinctive sequence | Synonyms: air, line, melodic line, melodic phrase, melody, tune |
| (noun) a special variety of domesticated animals within a species | Synonyms: breed, stock |
| (noun) (biology) a group of organisms within a species that differ in trivial ways from similar groups | Synonyms: form, var., variant |
| (noun) (physics) deformation of a physical body under the action of applied forces | - |
| (noun) injury to a muscle (often caused by overuse); results in swelling and pain | - |
| (noun) (psychology) nervousness resulting from mental stress | Synonyms: mental strain, nervous strain |
| (noun) difficulty that causes worry or emotional tension | Synonyms: stress |
| strainer | (noun) a filter to retain larger pieces while smaller pieces and liquids pass through | - |
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| straining | (noun) the act of distorting something so it seems to mean something it was not intended to mean | Synonyms: distortion, overrefinement, torture, twisting |
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| (noun) an intense or violent exertion | Synonyms: strain |
| strait | (noun) a narrow channel of the sea joining two larger bodies of water | Synonyms: sound |
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| (noun) a bad or difficult situation or state of affairs | Synonyms: pass, straits |
| straitjacket | (noun) a garment similar to a jacket that is used to bind the arms tightly against the body as a means of restraining a violent person | Synonyms: straightjacket |
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| (noun) anything immaterial that severely hinders or confines | - |
| straits | (noun) a difficult juncture | Synonyms: head, pass |
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| (noun) a bad or difficult situation or state of affairs | Synonyms: pass, strait |
| tetraiodothyronine | (noun) hormone produced by the thyroid glands to regulate metabolism by controlling the rate of oxidation in cells | Synonyms: T, thyroxin, thyroxine |
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| trail | (noun) a path or track roughly blazed through wild or hilly country | - |
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| (noun) evidence pointing to a possible solution | Synonyms: lead, track |
| (noun) a track or mark left by something that has passed | - |
| trailblazer | (noun) someone who marks a trail by leaving blazes on trees | - |
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| (noun) someone who helps to open up a new line of research or technology or art | Synonyms: groundbreaker, innovator, pioneer |
| trailer | (noun) a wheeled vehicle that can be pulled by a car or truck and is equipped for occupancy | Synonyms: house trailer |
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| (noun) a large transport conveyance designed to be pulled by a truck or tractor | - |
| (noun) an advertisement consisting of short scenes from a motion picture that will appear in the near future | Synonyms: preview, prevue |
| (noun) someone who takes more time than necessary; someone who lags behind | Synonyms: dawdler, drone, laggard, lagger, poke |
| trailhead | (noun) the beginning of a trail | Synonyms: trail head |
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| trailing | (noun) the pursuit (of a person or animal) by following tracks or marks they left behind | Synonyms: tracking |
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| train | (noun) public transport provided by a line of railway cars coupled together and drawn by a locomotive | Synonyms: railroad train |
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| (noun) wheelwork consisting of a connected set of rotating gears by which force is transmitted or motion or torque is changed | Synonyms: gear, gearing, geartrain, power train |
| (noun) piece of cloth forming the long back section of a gown that is drawn along the floor | - |
| (noun) a series of consequences wrought by an event | - |
| (noun) a procession (of wagons or mules or camels) traveling together in single file | Synonyms: caravan, wagon train |
| (noun) a sequentially ordered set of things or events or ideas in which each successive member is related to the preceding | Synonyms: string |
| trainband | (noun) a company of militia in England or America from the 16th century to the 18th century | - |
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| trainbandsman | (noun) a member of a trainband | - |
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| trainbearer | (noun) one who holds up the train of a gown or robe on a ceremonial occasion | - |
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| trainee | (noun) someone who is being trained | - |
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| traineeship | (noun) financial aid that enables you to get trained for a specified job | - |
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| trainer | (noun) simulator consisting of a machine on the ground that simulates the conditions of flying a plane | Synonyms: flight simulator |
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| (noun) one who trains other persons or animals | - |
| training | (noun) activity leading to skilled behavior | Synonyms: grooming, preparation |
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| (noun) the result of good upbringing (especially knowledge of correct social behavior) | Synonyms: breeding, education |
| trainload | (noun) quantity that can be carried by a train | - |
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| trainman | (noun) an employee of a railroad | Synonyms: railroad man, railroader, railway man, railwayman |
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| trainmaster | (noun) a railroad employer who is in charge of a railway yard | Synonyms: train dispatcher, yardmaster |
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| trait | (noun) a distinguishing feature of your personal nature | - |
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| traitor | (noun) someone who betrays his country by committing treason | Synonyms: treasonist |
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| (noun) a person who says one thing and does another | Synonyms: betrayer, double-crosser, double-dealer, two-timer |
| traitorousness | (noun) disloyalty by virtue of subversive behavior | Synonyms: subversiveness, treason |
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| traitress | (noun) female traitor | - |
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| unconstraint | (noun) the trait of lacking restraint or control; reckless freedom from inhibition or worry | Synonyms: abandon, wantonness |
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| unrestraint | (noun) the quality of lacking restraint | - |
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