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Define the word tetraiodothyronine

"tetraiodothyronine" wn "WordNet (r) 2.0"

tetraiodothyronine
     n : hormone produced by the thyroid glands to regulate
         metabolism by controlling the rate of oxidation in cells;
         "thyroxine is 65% iodine" [syn: thyroxine, thyroxin,
         T]