a combining form used in the names of chemical compounds in which the hydroxyl group is present: hydroxyketone.
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containing the hydroxyl group.
Also, hydroxy.

1865–70; hydr-2 + ox(y)- + -yl

hydroxylic [hahy-drok-sil-ik] , adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
hydroxy (haɪˈdrɒksɪ)
(of a chemical compound) containing one or more hydroxyl groups
[C19: hydro- + oxy(gen)]

combining form
(in chemical compounds) indicating the presence of one or more hydroxyl groups or ions
[from hydro- + oxy(gen)]

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

hydroxy- pref.
Having, adding, or substituting a hydroxyl radical in a compound: hydroxyapatite.

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
hydroxy   (hī-drŏk'sē)  Pronunciation Key 
Containing the hydroxyl group (OH).
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 for hydroxy
Coumaric acids are organic compounds that are hydroxy derivatives of cinnamic acid.
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