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a combining form meaning “egg,” used in the formation of compound words:
Origin of oo-
< Greek ōio-, combining form of ōión egg1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for oo-


combining form
egg or ovum: oosperm
Word Origin
from Greek ōionegg1
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
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Word Origin and History for oo-

word-forming element meaning "egg, eggs," from Greek oon "egg," cognate with Latin ovum, Old Norse egg (see egg (n.)).

Online Etymology Dictionary, © 2010 Douglas Harper
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oo- in Medicine

oo- pref.
Egg; ovum: oogenesis.

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