o-

o-

1
Chemistry.
an abridgment of ortho-.
Dictionary.com Unabridged

o-

2
variant of ob- before m: omission.

o-

3
variant of oo-: oidium.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
o-
 
prefix
short for ortho-

O'-
 
prefix
(in surnames of Irish Gaelic origin) descendant of: O'Corrigan
 
[from Irish Gaelic ó, ua descendant]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

o- abbr.
ortho- (often italic)

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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