# biotin

> English word · Noun · IPA /ˈbaɪətɪn/ · frequency rank #50,980

## Definitions
1. A sulfur-containing member of the vitamin B complex, 5-[(3aS,4S,6aR)-2-oxohexahydro-1H-thieno[3,4-d]imidazol-4-yl]pentanoic acid, found in liver, egg yolk, milk, and yeast, essential to the activity of multiple enzyme systems.

## Etymology
Borrowed from German Biotin, from Ancient Greek βίοτος (bíotos, “life”) + the suffix -in.

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