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tryptophan an essential amino acid in animals that is a component of proteins and a precursor of serotonin and niacin.
trysail a small fore-and-aft sail, usu. hoisted when other sails have been lowered, that helps keep a vessel headed into the wind.
try square a device consisting of a ruled straightedge set at right angles to another straightedge, used by carpenters in testing for squareness or marking out right angles.
tryst a meeting held at a specified time and place, esp. a secret meeting of lovers; rendezvous. [3 definitions]
tsar variant of czar.
tsarevitch see czarevitch.
tsarevna see czarevna.
tsarina see czarina.
tsetse fly a bloodsucking African fly, some species of which transmit sleeping sickness and other infections to humans and domestic animals.
T-shirt a collarless undershirt with short sleeves, worn esp. by men and boys. [2 definitions]
tsk used to express annoyance, sympathy, disapproval, or the like.
tsp. abbreviation of "teaspoon" or "teaspoons."
T square a T-shaped ruler having a short crosspiece that fits over the edge of a drawing board, used by drafters to draw parallel lines.
T-strap a T-shaped strap over the instep of a woman's or girl's shoe. [2 definitions]
tsunami a very large, often destructive sea wave caused by a marine earthquake or volcanic explosion.
tsutsugamushi disease see scrub typhus.
tuatara a large lizardlike reptile of the area near New Zealand.
tub a large low, usu. round, flat-bottomed container used for washing, packing, storing, or the like. [4 definitions]
tuba one of a family of large, oval, brass wind instruments that produce notes in the bass range.
tubal of, concerning, or taking place in a tube, esp. the Fallopian tube.
tubate having, consisting of, or forming a tube or tubes; tubular.