# carboxyl

> English word · Noun · IPA /kɑː(ɹ)ˈbɒksɪl/ · frequency rank #77,506

## Definitions
1. A univalent functional group consisting of a carbonyl and a hydroxyl functional group (-CO.OH); characteristic of carboxylic acids.

## Etymology
Blend of carbonyl + hydroxyl.

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