# histidine

> English word · Noun · frequency rank #70,747

## Definitions
1. An essential amino acid C₆H₉N₃O₂ found in most animal proteins; essential for tissue growth and repair.

## Etymology
From histo- + -idine.

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