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[hahy-drok-suh l] /haɪˈdrɒk səl/
containing the hydroxyl group.
Origin of hydroxyl
1865-70; hydr-2 + ox(y)-2 + -yl
Related forms
[hahy-drok-sil-ik] /ˌhaɪ drɒkˈsɪl ɪk/ (Show IPA),
adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for hydroxyl
  • The naturally occurring chemical, called a hydroxyl radical, consists of an oxygen atom and a hydrogen atom.
  • When this happens to protons they are expected to interact with the oxygen in the lunar regolith to produce hydroxyl and water.
  • Hydrogen and oxygen in these cells react to form hydroxyl ions and electrons.
  • Water and other molecules already present in the pores of the electrode react with the oxygen to produce hydroxyl.
British Dictionary definitions for hydroxyl


(modifier) of, consisting of, or containing the monovalent group -OH or the ion OH: a hydroxyl group or radical
Derived Forms
hydroxylic, 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
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hydroxyl in Medicine

hydroxyl hy·drox·yl (hī-drŏk'sĭl)
The univalent radical or group OH, a characteristic component of bases, certain acids, phenols, alcohols, carboxylic and sulfonic acids, and amphoteric compounds.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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hydroxyl in Science
The group OH. Hydroxyl is present in bases, certain acids, hydroxides, and alcohols.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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