• synonyms


[hahy-drok-sahyd, -sid]
  1. a chemical compound containing the hydroxyl group.
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Origin of hydroxide

First recorded in 1820–30; hydr-2 + oxide
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for hydroxide

Historical Examples of hydroxide

  • The most important are the sulphide, carbonate, and hydroxide.

    An Elementary Study of Chemistry

    William McPherson

  • If the solution of borax is dilute, however, an hydroxide of silver forms.

  • It is then returned to the hydroxide for continuation of the process.

    The Science of Fingerprints

    Federal Bureau of Investigation

  • When the acid part of the salt has been entirely replaced in this way, the compound is called a hydroxide or hydrate of the metal.

  • Hydroxide, hī-droks′īd, n. a metallic or basic radical combined with one or more hydroxyl groups.

British Dictionary definitions for hydroxide


  1. a base or alkali containing the ion OH
  2. any compound containing an -OH group
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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

Word Origin and History for hydroxide


1851, from hydro- + oxide.

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Online Etymology Dictionary, © 2010 Douglas Harper

hydroxide in Medicine


  1. A chemical compound containing the hydroxyl group, especially one that releases a hydroxyl group when dissolved.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

hydroxide in Science


  1. A chemical compound containing one or more hydroxyl radicals (OH). Inorganic hydroxides include hydroxides of metals, some of which, like sodium hydroxide (caustic soda) and calcium hydroxide, are strong bases that are important industrial alkalis. Some metal hydroxides, such as those of zinc and lead, are amphoteric (they act like both acids and bases). Organic hydroxides include the alcohols.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.