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British Dictionary definitions for oxa-

oxa-

before a vowel ox-

combining form
  1. indicating that a chemical compound contains oxygen, used esp to denote that a heterocyclic compound is derived from a specified compound by replacement of a carbon atom with an oxygen atomoxazine
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