| tachygraphy | (noun) a method of writing rapidly using an abbreviated symbolic system | Synonyms: shorthand, stenography |
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| tachylite | (noun) a basic or basalt glass | - |
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| tachymeter | (noun) a theodolite designed for rapid measurements | Synonyms: tacheometer |
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| taoiseach | (noun) the prime minister of the Irish Republic | - |
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| tauromachy | (noun) the activity at a bullfight | Synonyms: bullfighting |
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| teach | (verb) accustom gradually to some action or attitude | - |
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| (verb) impart skills or knowledge to | Synonyms: instruct, learn |
| teachable | (adjective) ready and willing to be taught | Synonyms: docile |
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| teacher | (noun) a personified abstraction that teaches | - |
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| (noun) a person whose occupation is teaching | Synonyms: instructor |
| teachership | (noun) the position of teacher | - |
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| teaching | (noun) the profession of a teacher | Synonyms: instruction, pedagogy |
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| (noun) the activities of educating or instructing; activities that impart knowledge or skill | Synonyms: didactics, education, educational activity, instruction, pedagogy |
| (noun) a doctrine that is taught | Synonyms: commandment, precept |
| tetrachlorethylene | (noun) anthelmintic agent used against hookworm and other nematodes | Synonyms: carbon dichloride, ethylene tetrachloride, tetrachloroethylene |
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| tetrachloride | (noun) any compound that contains four chlorine atoms per molecule | - |
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| tetrachloroethylene | (noun) anthelmintic agent used against hookworm and other nematodes | Synonyms: carbon dichloride, ethylene tetrachloride, tetrachlorethylene |
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| tetrachloromethane | (noun) a colorless nonflammable liquid used as a solvent for fats and oils; because of its toxicity its use as a cleaning fluid or fire extinguisher has declined | Synonyms: carbon tet, carbon tetrachloride, perchloromethane |
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| toothache | (noun) an ache localized in or around a tooth | Synonyms: odontalgia |
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| trachea | (noun) membranous tube with cartilaginous rings that conveys inhaled air from the larynx to the bronchi | Synonyms: windpipe |
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| (noun) one of the tubules forming the respiratory system of most insects and many arachnids | - |
| tracheal | (adjective) relating to or resembling or functioning like a trachea | - |
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| tracheid | (noun) long tubular cell peculiar to xylem | - |
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| tracheitis | (noun) inflammation of the trachea | - |
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| tracheobronchitis | (noun) common respiratory infection characterized by inflammation of the trachea and the bronchi | - |
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| tracheophyte | (noun) green plant having a vascular system: ferns, gymnosperms, angiosperms | Synonyms: vascular plant |
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| tracheostomy | (noun) a surgical operation that creates an opening into the trachea with a tube inserted to provide a passage for air; performed when the pharynx is obstructed by edema or cancer or other causes | Synonyms: tracheotomy |
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| tracheotomy | (noun) a surgical operation that creates an opening into the trachea with a tube inserted to provide a passage for air; performed when the pharynx is obstructed by edema or cancer or other causes | Synonyms: tracheostomy |
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| trachodon | (noun) large duck-billed dinosaur of the Cretaceous period | Synonyms: trachodont |
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| trachodont | (noun) large duck-billed dinosaur of the Cretaceous period | Synonyms: trachodon |
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| trachoma | (noun) a chronic contagious disease caused by a bacterium and marked by inflammation of the conjunctiva and cornea of the eye and the formation of scar tissue | - |
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| treacherous | (adjective) dangerously unstable and unpredictable | Synonyms: unreliable |
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| (adjective) tending to betray; especially having a treacherous character as attributed to the Carthaginians by the Romans | Synonyms: perfidious, punic |
| treacherously | (adverb) in a disloyal and faithless manner | Synonyms: faithlessly, false, traitorously, treasonably |
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| treacherousness | (noun) The characteristic of providing insecure footing or support; of being marked by hidden dangers, hazards, or perils. | - |
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| treachery | (noun) an act of deliberate betrayal | Synonyms: betrayal, perfidy, treason |
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| (noun) betrayal of a trust | Synonyms: perfidiousness, perfidy |
| unachievable | (adjective) impossible to achieve | Synonyms: unattainable, undoable, unrealizable |
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| unachievably | (adverb) in an unattainable manner or to an unattainable degree | Synonyms: unattainably |
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| unapproachability | (noun) a disposition to be unapproachable; unfriendly and inaccessible | - |
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| unapproachable | (adjective) discouraging intimacies; reserved | - |
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| (adjective) inaccessibly located or situated | Synonyms: out of reach, unreachable, unreached |
| unattached | (adjective) not associated in an exclusive sexual relationship | Synonyms: uncommitted |
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| (adjective) not fastened together | - |
| (adjective) (of animals) able to swim about; not attached | Synonyms: free-swimming |
| unbleached | (adjective) not artificially colored or bleached | Synonyms: uncolored, undyed |
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| underachieve | (verb) perform less well or with less success than expected | Synonyms: underperform |
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| underachievement | (noun) poorer than expected performance (poorer than might have been predicted from intelligence tests) | - |
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| underachiever | (noun) a student who does not perform as well as expected or as well as the IQ indicates | Synonyms: nonachiever, underperformer |
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| unimpeachable | (adjective) completely acceptable; not open to exception or reproach | Synonyms: unexceptionable |
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| (adjective) free of guilt; not subject to blame | Synonyms: blameless, inculpable, irreproachable |
| (adjective) beyond doubt or reproach | - |
| unimpeachably | (adverb) without question | Synonyms: unquestionably |
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| unreachable | (adjective) inaccessibly located or situated | Synonyms: out of reach, unapproachable, unreached |
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| unreached | (adjective) inaccessibly located or situated | Synonyms: out of reach, unapproachable, unreachable |
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| unteach | (verb) cause to disbelieve; teach someone the contrary of what he or she had learned earlier | - |
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| (verb) cause to unlearn | - |
| viscacha | (noun) gregarious burrowing rodent larger than the chinchillas | Synonyms: chinchillon, Lagostomus maximus |
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| yacht | (noun) an expensive vessel propelled by sail or power and used for cruising or racing | Synonyms: racing yacht |
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| (verb) travel in a yacht | - |
| yachting | (noun) water travel for pleasure | Synonyms: boating |
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| yachtsman | (noun) a male person who owns or sails a yacht | - |
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| yachtsperson | (noun) a person who owns or sails a yacht | - |
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| yachtswoman | (noun) a female person who owns or sails a yacht | - |
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