o- Hear it!

o- definition

o-

ortho- (sense ): usually italicized and hyphenated in chemical names
O'- definition

O'- (ō)

descendant of: used in Irish surnames O'Reilly

Etymology: Ir ō, descendant

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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