oxo-

before a vowel ox-

combining form
  1. indicating that a chemical compound contains oxygen linked to another atom by a double bond, used esp to denote that a compound is derived from a specified compound by replacement of a methylene group with a carbonyl groupoxobutanoic acid
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

oxo- in Medicine

oxo-

pref.
  1. Oxygen:oxosuccinic acid.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.