[thahy-rok-seen, -sin]


  • Biochemistry: the thyroid gland hormone that regulates the metabolic rate of the body.
  • Pharmacology: a commercial form of this compound, obtained from the thyroid glands of animals or synthesized, used in the treatment of hypothyroidism. Symbol: T 4.

Also, thyroxin [thahy-rok-sin]

Source: dictionary.reference.com/browse/thyroxine?s=t

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