[ hahy-droh-kwi-nohn, -druh-kwin-ohn ]
/ ˌhaɪ droʊ kwɪˈnoʊn, -drəˈkwɪn oʊn /
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noun Chemistry.

a white, crystalline compound, C6H6O2, formed by the reduction of quinone: used chiefly in photography and to inhibit autoxidation reactions.



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Also called hy·dro·quin·ol [hahy-druh-kwin-awl, -ol], /ˌhaɪ drəˈkwɪn ɔl, -ɒl/, quinol.

Origin of hydroquinone

First recorded in 1860–65; hydro-1 + quinone
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

Example sentences from the Web for hydroquinone

British Dictionary definitions for hydroquinone


hydroquinol (ˌhaɪdrəʊˈkwɪnɒl)

/ (ˌhaɪdrəʊkwɪˈnəʊn) /


a white crystalline soluble phenol used as a photographic developer; 1,4-dihydroxybenzene. Formula: C 6 H 4 (OH) 2Also called: quinol
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medical definitions for hydroquinone

[ hī′drō-kwĭ-nōn, -kwĭnōn′ ]


A white crystalline compound used as an antioxidant, a stabilizer, and a reagent.hydroquinol
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.