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o-1

Chemistry.
  1. an abridgment of ortho-.
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o-2

  1. variant of ob- before m: omission.
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o-3

  1. variant of oo-: oidium.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for o-

o-

prefix
  1. short for ortho- (def. 4)
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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

o- in Medicine

o-

abbr.
  1. ortho- (often italic)
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.