• synonyms


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

< Greek ōio-, combining form of ōión egg1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for oo-



combining form
  1. egg or ovumoosperm
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Word Origin for oo-

from Greek ōion egg 1
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

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.)).

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Online Etymology Dictionary, © 2010 Douglas Harper

oo- in Medicine


  1. Egg; ovum:oogenesis.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.