/ Dictionary / Index O oospore: Meaning and Definition of Find definitions for: o•o•spore Pronunciation: (ō'u-spôr", -spōr"), [key] — n. Biol. a fertilized egg within an oogonium. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: oospore (Thesaurus) oosphere Oost 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