# casein

> English word · Noun · IPA /ˈkeɪ.siːn/ · frequency rank #50,416

## Definitions
1. A protein present in both milk and in the seeds of leguminous plants.

## Etymology
From French caséine, formed from Latin cāseus (“cheese”) + -ine.

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