# thyroxine

> English word · Noun · IPA /θaɪˈrɒk.siːn/ · frequency rank #91,069

## Definitions
1. A thyroid hormone, with the chemical formula C₁₅H₁₁I₄NO₄, that regulates cell metabolism and growth.

## Etymology
From thyr- (“thyroid”) + ox- (“oxygen”) + -ine.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/thyroxine