/ Dictionary / Index O ooblast: Meaning and Definition of Find definitions for: o•o•blast Pronunciation: (ō'u-blast"), [key] — n. a primordial cell from which the ovum is developed. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. o-o oocyst 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