# diacetyl

> English word · Noun · frequency rank #98,023

## Definitions
1. Two acetyl groups in a compound
2. Synonym of butanedione.

## Etymology
From di- + acetyl.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-09-03.
Canonical page: https://plainspell.com/en/word/diacetyl