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truth agreement with fact or reality. [6 definitions]
truthful tending to adhere to the truth; habitually honest. [2 definitions]
truth serum a drug that makes a subject talkative or open to suggestion and perhaps likely to reveal consciously or unconsciously withheld information, used by police or military interrogators and some psychotherapists.
truth table a table that indicates the degree of truth of a compound statement in logic, mathematics, or the like, for every possible combination of the truth-values of its components.
try to attempt through deliberate effort. [7 definitions]
trying causing extreme annoyance, hardship, or irritation.
try on to put on an article of clothing in order to test the desirability of its size or appearance.
tryout a test or pretest to ascertain utility, fitness, or skill; audition; trial run.
try out to enter into a competition, as for a job, play, or sport. [2 definitions]
trypanosome any of a group of very small flagellate protozoans that are parasitic in the blood of humans and other vertebrates, are usu. spread by insect bites, and often cause serious diseases.
trypanosomiasis any disease caused by a trypanosome.
trypsin an enzyme in pancreatic juice that converts proteins into polypeptides.
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.