thy·rox·ine /θaɪˈrɑkˌsin, sən/
  甲狀腺素
  thy·rox·ine /θaɪˈrɑkˌsɪn, sən/ 名詞
  thyroxine
       n : hormone produced by the thyroid glands to regulate
           metabolism by controlling the rate of oxidation in cells;
           "thyroxine is 65% iodine" [syn: thyroxin, tetraiodothyronine,
            T]