containing the hydroxyl group.
Also, hydroxy.

1865–70; hydr-2 + ox(y)- + -yl

hydroxylic [hahy-drok-sil-ik] , adjective
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World English Dictionary
hydroxyl (haɪˈdrɒksɪl)
(modifier) of, consisting of, or containing the monovalent group -OH or the ion OH--: a hydroxyl group or radical

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American Heritage
Medical Dictionary

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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American Heritage
Science Dictionary
hydroxyl   (hī-drŏk'sĭl)  Pronunciation Key 
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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Example sentences
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.
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