Main Entry: thy·rox·ine

Variant(s): or thy·rox·in \thī-ˈräk-ˌsēn, -sən\

Function: noun

: an iodine containing hormone C₁₅H₁₁I₄NO₄ that is an amino acid produced by the thyroid gland as a product of the cleavage of thyroglobulin, increases the metabolic rate, and is used to treat thyroid disorders—called also T4