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OO

[oh-oh]

Origin

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.

Also, o·o, o’·o.

Origin:
1885–90; < Hawaiian ʿōʿō

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Oo is always a great word to know.

So is quincunx. Does it mean:

a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.

an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.

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Dictionary.com Unabridged

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

Origin:
< Greek ōio-, combining form of ōión egg¹

noun

owned and operated.

Also, O&O

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Link To OO

Etymonline

Word Origin & History

oo-

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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FOLDOC

Computing Dictionary