• synonyms


or hy·drox·y

[hahy-drok-suh l]
  1. containing the hydroxyl group.
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Origin of hydroxyl

First recorded in 1865–70; hydr-2 + ox(y)-2 + -yl
Related formshy·drox·yl·ic [hahy-drok-sil-ik] /ˌhaɪ drɒkˈsɪl ɪk/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for hydroxyl

Historical Examples

  • These contain the group, or radical OH, hydroxyl, once or oftener.

    The Dyeing of Woollen Fabrics

    Franklin Beech

  • This would then lead to curious conclusions concerning the hydroxyl group.

  • For instance, an alkyl may be substituted for the hydroxyl hydrogen in an alcohol molecule, when an ether results.

  • Those four atoms are called the methyl group, and a methyl group combined with a hydroxyl group forms methyl alcohol.

  • First, the hydrogen is displaced by the chlorine: then the chlorine is turned out and its place taken by the hydroxyl.

British Dictionary definitions for hydroxyl


  1. (modifier) of, consisting of, or containing the monovalent group -OH or the ion OH a hydroxyl group or radical
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Derived Formshydroxylic, adjective
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

hydroxyl in Medicine


  1. The univalent radical or group OH, a characteristic component of bases, certain acids, phenols, alcohols, carboxylic and sulfonic acids, and amphoteric compounds.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

hydroxyl in Science


  1. The group OH. Hydroxyl is present in bases, certain acids, hydroxides, and alcohols.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.