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hydroxy-

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  1. a combining form used in the names of chemical compounds in which the hydroxyl group is present: hydroxyketone.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for hydroxy-

hydroxy-

combining form
  1. (in chemical compounds) indicating the presence of one or more hydroxyl groups or ions
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Word Origin

from hydro- + oxy (gen)
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

hydroxy- in Medicine

hydroxy-

pref.
  1. Having, adding, or substituting a hydroxyl radical in a compound:hydroxyapatite.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.