1. thymine, T, pyrimidine

usage: a base found in DNA (but not in RNA) and derived from pyrimidine; pairs with adenine

2. deoxythymidine monophosphate, T, nucleotide, base

usage: one of the four nucleotides used in building DNA; all four nucleotides have a common phosphate group and a sugar (ribose)

3. metric ton, MT, tonne, t, metric weight unit, weight unit

usage: a unit of weight equivalent to 1000 kilograms

4. T, t, letter, letter of the alphabet, alphabetic character

usage: the 20th letter of the Roman alphabet

5. triiodothyronine, liothyronine, T, thyroid hormone

usage: 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

6. thyroxine, thyroxin, tetraiodothyronine, T, thyroid hormone

usage: hormone produced by the thyroid glands to regulate metabolism by controlling the rate of oxidation in cells; "thyroxine is 65% iodine"

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