[n] hormone produced by the thyroid glands to regulate metabolism by controlling the rate of oxidation in cells; "thyroxine is 65% iodine"
[n] 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
[n] the 20th letter of the Roman alphabet
[n] a unit of weight equivalent to 1000 kilograms
[n] one of the four nucleotides used in building DNA; all four nucleotides have a common phosphate group and a sugar (ribose)