• synonyms


[hahy-droh-kwi-nohn, -druh-kwin-ohn]
noun Chemistry.
  1. a white, crystalline compound, C6H6O2, formed by the reduction of quinone: used chiefly in photography and to inhibit autoxidation reactions.
Show More

Origin of hydroquinone

First recorded in 1860–65; hydro-1 + quinone
Also called hy·dro·quin·ol [hahy-druh-kwin-awl, -ol] /ˌhaɪ drəˈkwɪn ɔl, -ɒl/, quinol.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for hydroquinone

Historical Examples

  • Hydroquinone as a developer was introduced this year by Eder and Toth, but it did not make much progress at first.

    The Evolution of Photography

    John Werge

  • By reaction with sodium sulphite it is converted into a hydroquinone sulphonate of deep purple colour.

  • Hydroquinone was obtained by Caventou and Pelletier by heating quinic acid, but these chemists did not recognize its true nature.


    Raphael Meldola

  • When phenol is oxidized in acid solution by chlorine, tetrachlorquinone is obtained, a compound also obtainable from hydroquinone.

  • When hydrolyzed by mineral acids or emulsin, it yields glucose and hydroquinone.

    The Chemistry of Plant Life

    Roscoe Wilfred Thatcher

British Dictionary definitions for hydroquinone


hydroquinol (ˌhaɪdrəʊˈkwɪnɒl)

  1. a white crystalline soluble phenol used as a photographic developer; 1,4-dihydroxybenzene. Formula: C 6 H 4 (OH) 2Also called: quinol
Show More
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

hydroquinone in Medicine


(hī′drō-kwĭ-nōn, -kwĭnōn′)
  1. A white crystalline compound used as an antioxidant, a stabilizer, and a reagent.hydroquinol
Show More
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.