/ Dictionary / Index O o-o: Meaning and Definition of Find definitions for: o-o Pronunciation: (ō'ō), [key] — pl. o-os. any of several species of Hawaiian honey eaters of the genus Moho, esp. 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. oo- Pronunciation: [key] a combining form meaning “egg,” used in the formation of compound words: oogamous. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. onyx marble ooblast Related Content Daily Word Quiz: philtrum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language