| tetrachromat | n. | person who is able to perceive many more colors than usual due to a fourth type of cone cells in the retina | ||
| thatness | n. | quality of existence, of being a specific thing | ||
| the Big Smoke | n. | London; any big city | British | |
| thence | adv. | from that place; from that time; from that cause or source | ||
| thentofore | adv. | until that time; before then | obsolete | |
| theodicy | n. | vindication of divinity in the face of worldly evils | ||
| theodolite | n. | portable surveying instrument with telescopic sight for measuring horizontal, and sometimes vertical, angles | ||
| theomachy | n. | fight against or among gods | ||
| theophany | n. | appearance or manifestation of god to someone | ||
| therblig | n. | basic unit of motion used by manual workers (according to system created by Frank and Lillian Gilbreth, American industrial psychologists) | ||
| theretofore | adv. | previously | ||
| theriac | n. | antidote; specifically a medical paste compounded of many ingredients used by Greeks to cure poisons | ||
| theriomorphic | adj. | of animal or beastly form | ||
| thermotaxic | adj. | of or related to biological heat regulation | ||
| thesicle | n. | subthesis | ||
| theurgist | n. | practitioner of ‘white magic’ of Egyptian type, magician | ||
| thigmotropism | n. | change in a plant’s growth based upon touch stimulus | ||
| thimblerig | n. | rigged game in which the mark is asked to guess under which cup the operator has hidden the pea, shell game | ||
| thirl | v. | to pierce, to drill | ||
| thitherward | adv. | toward that place; on the way thither | ||
| thoroughbrace | n. | leather strap suspending carriage for comfort and dampening | ||
| thrang | adj. | busy, occupied with work | Scots | |
| thrasonical | adj. | bragging, boastful | ||
| thrawn | adj. | twisted, misshapen; perverse, obstinate | ||
| threap | v. | to chide, scold, rebuke, blame, reprove; to bicker, argue, quarrel, dispute | ||
| threnody | n. | song or poem of lamentation, dirge, song for the dead | ||
| thrips | n. | teeny tiny insect which flies using the ‘clap and fling’ method | ||
| thrombus | n. | blood clot formed within an organism’s blood vessels | ||
| throstle | n. | a thrush | ||
| thunder mug | n. | small portable signal cannon with a handle; chamber pot | slang | |
| thurifer | n. | acolyte carrying the thurible | ||
| thyratron | n. | gas-filled cathode tube acting as electrical switch and rectifier | ||
| tick | n. | cloth cover or case to hold filling (feathers, hair, etc.) used to form a mattress or pillow | ||
| tignon | n. | woman’s headcovering using a cloth to make a sort of turban, first worn by Creoles in Louisiana | ||
| tigurine | adj. | Zwinglian, of or related to Zurich | ||
| tilbury | n. | open light two-wheeled carriage | ||
| tilth | n. | tillage; cultivated land | ||
| timeserver | n. | person putting in minimal effort at work, due to burnout or closeness to retirement age; one who conforms to the opinions of those in power | ||
| timoneer | n. | steersman, helmsman | ||
| tine | v. | to lose | Scots | |
| tineman | n. | night officer of the forest in medieval England | ||
| tinkler | n. | (usu. tinker) itinerant metal worker, usu. a gypsy | Scots | |
| tinnitus | n. | ringing in the ears | ||
| tintamarre | n. | ruckus, brouhaha; Acadian tradition of marching through village while using noisemakers and voices to make a stir | ||
| tintinnabulation | n. | ringing or sound of bells | ||
| tippet | n. | narrow scarf worn with ends hanging down over shoulders; band of silk worn by clergy around neck with ends pendent from shoulders; woman’s shawl or scarf worn around neck and shoulders | ||
| tippex | v. | trademarked correction fluid similar to Wite-Out; to erase using such fluid | British | |
| tipstaff | n. | sheriff’s officer, bailiff, court usher; ceremonial staff with metal tip | ||
| tire | v. | to dress, to attire | obsolete | |
| tirewoman | n. | lady’s maid, woman who assists with another’s toilet |
