# hydroquinone

> English word · Noun · IPA /ˌhaɪdɹəˈkwɪnəʊn/ · frequency rank #94,973

## Definitions
1. The diphenol para-dihydroxy benzene, used as a mild reducing agent in photographic developing; isomeric with catechol and resorcinol.

## Etymology
From hydro- + quinone.

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