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T (iou)



T, t. [ti:]
The twentieth letter of the modern English alphabet and the nineteenth of the ancient Roman one, corresp. to Greek tau, Hebrew taw. The sound normally represented by the letter is a voiceless alveolar plosive consonant. In modern English T also has the sound , any of a class of relatively young bright variable stars.
a. Physics. Used to denote the quantum number of isospin.
b. Bacteriology. (Cap. T. With following numeral.) Used to denote certain strains of phages of the bacterium Escherichia coli much used experimentally; T-even, designating the strains for which the numeral is even.
c. Used to denote the time at which an event is scheduled to occur, esp. that at which a spacecraft is due to be launched.
d. Biology. (Cap. T.) Designating lymphocytes that are derived from or have been processed by the thymus, which are responsible for cellular immune reactions.
Statistics. t test, = Student's test s.v. STUDENT noun2.
III.
Abbrevs.: T = (Music) tasto; taxed (officially stamped on a letter); (Music) tempo; (Music) tenor; (as prefix) tera-; (Physics) tesla; thunder (in a ship's logbook); (Biology) thymine (in DNA sequences); (Physics) time; (Linguistics) transformational (as in T-rule); (Photography) transmission (in T-stop, a measured point on a scale of aperture values based on the actual light transmitted through a camera lens); treasury (in T-Bill); tri- (in 2,4,5-T, 2,4,5-trichlorophenoxyacetic acid, C6H2Cl3OCH2COOH, a selective herbicide used esp. for controlling brushwood); (Physics & Chemistry) tritium; (Music) tutti. t. = ton(s); tonne(s). t (Physics) = top or truth (a quark flavour).