副甲状腺素 fùjiǎzhuàngxiànsù parathyroid hormone Origin Definitions Defs Strokes Stroke Words Sentences Sents 副 fù adjective vice- deputy; assistant; secondary; auxiliary; subsidiary甲状腺素 甲狀腺素 jiǎzhuàngxiànsù thyroxine thyroxine; thyroid hormone. A hormone produced by the thyroid gland that regulates metabolism and growth, often used as a medication to treat an underactive thyroid.