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n 1: a base found in DNA (but not in RNA) and derived from pyrimidine; pairs with adenine [syn: {thymine}]
2: one of the four nucleotides used in building DNA; all four nucleotides have a common phosphate group and a sugar (ribose) [syn: {deoxythymidine monophosphate}] 3: a unit of weight equivalent to 1000 kilograms [syn: {metric ton}, {MT}, {tonne}] 4: a unit of information equal to a trillion (1,099,511,627,776) bytes or 1024 gigabytes [syn: {terabyte}, {TB}] 5: the 20th letter of the Roman alphabet 6: 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 [syn: {triiodothyronine}, {liothyronine}] 7: hormone produced by the thyroid glands to regulate metabolism by controlling the rate of oxidation in cells; "thyroxine is 65% iodine" [syn: {thyroxine}, {thyroxin}, {tetraiodothyronine}]