a combining form meaning “egg,” used in the formation of compound words: oogamous.

< Greek ōio-, combining form of ōión egg1

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World English Dictionary
oo- or oö-
combining form
egg or ovum: oosperm
[from Greek ōionegg1]
oö- or oö-
combining form
[from Greek ōionegg1]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

comb. form meaning "egg, eggs," from Gk. oon "egg," cognate with L. ovum, O.N. egg (see egg (n.)).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

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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