| tipstaff | (noun) staff with a metal tip carried as a sign of office by e.g. a bailiff or constable | - |
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| tipster | (noun) one who sells advice about gambling or speculation (especially at the racetrack) | Synonyms: tout |
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| topsail | (noun) a sail (or either of a pair of sails) immediately above the lowermost sail of a mast and supported by a topmast | - |
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| topside | (noun) (usually plural) weather deck; the part of a ship's hull that is above the waterline | - |
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| topsoil | (noun) the layer of soil on the surface | Synonyms: surface soil |
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| topspin | (noun) forward spin (usually of a moving ball) that is imparted by an upward stroke | - |
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| trapshooter | (noun) a person who engages in shooting at clay pigeons that are hurled into the air by a trap | - |
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| trapshooting | (noun) the sport of shooting at clay pigeons that are hurled upward in such a way as to simulate the flight of a bird | Synonyms: skeet, skeet shooting |
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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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| troops | (noun) soldiers collectively | Synonyms: military personnel, soldiery |
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| troopship | (noun) ship for transporting troops | - |
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| trypsin | (noun) an enzyme of pancreatic origin; catalyzes the hydrolysis of proteins to smaller polypeptide units | - |
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| trypsinogen | (noun) inactive precursor of trypsin; a substance secreted by the pancreas and converted to active trypsin by enterokinase in the small intestine | - |
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| turps | (noun) volatile liquid distilled from turpentine oleoresin; used as paint thinner and solvent and medicinally | Synonyms: oil of turpentine, spirit of turpentine, turpentine |
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| upset | (noun) an improbable and unexpected victory | Synonyms: overturn |
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| (noun) the act of disturbing the mind or body | Synonyms: derangement, overthrow |
| (noun) the act of upsetting something | Synonyms: overturn, turnover |
| (noun) a tool used to thicken or spread metal (the end of a bar or a rivet etc.) by forging or hammering or swaging | Synonyms: swage |
| (noun) an unhappy and worried mental state | Synonyms: disturbance, perturbation |
| (noun) a physical condition in which there is a disturbance of normal functioning | Synonyms: disorder |
| upsetter | (noun) an unexpected winner; someone who defeats the favorite competitor | - |
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| upshot | (noun) a phenomenon that follows and is caused by some previous phenomenon | Synonyms: consequence, effect, event, issue, outcome, result |
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| upside | (noun) the highest or uppermost side of anything | Synonyms: top, top side, upper side |
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| upsilon | (noun) the 20th letter of the Greek alphabet | - |
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| upstage | (noun) the rear part of the stage | - |
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| upstager | (noun) a selfish actor who upstages the other actors | - |
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| upstairs | (noun) the part of a building above the ground floor | - |
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| upstart | (noun) a gymnastic exercise performed starting from a position with the legs over the upper body and moving to an erect position by arching the back and swinging the legs out and down while forcing the chest upright | Synonyms: kip |
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| (noun) a person who has suddenly risen to a higher economic status but has not gained social acceptance of others in that class | Synonyms: arriviste, nouveau-riche, parvenu |
| (noun) an arrogant or presumptuous person | - |
| upstroke | (noun) a stroke normally made in an upward direction | - |
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| upsurge | (noun) a sudden or abrupt strong increase | Synonyms: surge |
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| (noun) a sudden forceful flow | Synonyms: rush, spate, surge |
| whipsaw | (noun) a saw with handles at both ends; intended for use by two people | Synonyms: lumberman's saw, two-handed saw, two-man saw |
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| whipsnake | (noun) any of several small fast-moving snakes with long whiplike tails | Synonyms: whip-snake, whip snake |
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| whipstitch | (noun) a sewing stitch passing over an edge diagonally | Synonyms: whipping, whipstitching |
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| whipstitching | (noun) a sewing stitch passing over an edge diagonally | Synonyms: whipping, whipstitch |
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| xanthopsia | (noun) visual defect in which objects appear to have a yellowish hue; sometimes occurs in cases of jaundice | - |
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| yips | (noun) nervous tension that causes an athlete to fail (especially causes golfers to miss short putts) | - |
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| zoopsia | (noun) visual hallucination of animals; sometimes occurring in delirium tremens | - |
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