O and O

or O&O

[ oh uh nd oh ]
/ ˈoʊ ənd ˈoʊ /

owned and operated.


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

Origin of oo-

< Greek ōio-, combining form of ōión egg1


or o·o, o’·o

[ oh-oh ]
/ ˈoʊ oʊ /

noun, plural o-os.

any of several species of Hawaiian honey eaters of the genus Moho, especially the extinct M. nobilis, of the island of Hawaii, that had black plumage and two tufts of yellow plumes used to make ceremonial robes for the Hawaiian kings.

Origin of o-o

First recorded in 1885–90, o-o is from the Hawaiian word ʿōʿō

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for oo

British Dictionary definitions for oo



combining form

egg or ovumoosperm

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.)).

Online Etymology Dictionary, © 2010 Douglas Harper

Medicine definitions for oo



Egg; ovum:oogenesis.

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