Definition of

T

  1. (noun, body) hormone produced by the thyroid glands to regulate metabolism by controlling the rate of oxidation in cells
  2. (noun, body) thyroid hormone similar to thyroxine but with one less iodine atom per molecule and produced in smaller quantity; exerts the same biological effects as thyroxine but is more potent and briefer
  3. (noun, communication) the 20th letter of the Roman alphabet
  4. (noun, quantity) a unit of weight equivalent to 1000 kilograms
  5. (noun, substance) one of the four nucleotides used in building DNA; all four nucleotides have a common phosphate group and a sugar (ribose)
  6. (noun, substance) a base found in DNA (but not in RNA) and derived from pyrimidine; pairs with adenine

via WordNet, Princeton University

Origin of the word T

  1. to cross one's T's (and dot one's i's) "to be exact" is attested from 1849. Phrase to a T "exactly" is recorded from 1693, though the exact signification is uncertain, despite much speculation. The measuring tool called a T-square is recorded by that name from 1785. more

via Online Etymology Dictionary, ©2001 Douglas Harper

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