# metallothionein

> English word · Noun

## Definitions
1. Any of a family of cysteine-rich proteins that bond to heavy metals

## Etymology
From metallo- + thionein.

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