/ Dictionary / Index O oosphere: Meaning and Definition of Find definitions for: o•o•sphere Pronunciation: (ō'u-sfēr"), [key] — n. Biol. an unfertilized egg within an oogonium. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: oosphere (Thesaurus) oory oospore Related Content Daily Word Quiz: fervor Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language