/ Dictionary / Index O oocyte: Meaning and Definition of Find definitions for: o•o•cyte Pronunciation: (ō'u-sīt"), [key] — n. Cell Biol. an immature egg cell of the animal ovary; in humans, one oocyte matures during the menstrual cycle, becoming an ootid and then an ovum, while several others partially mature and then disintegrate. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: oocyte (Thesaurus) oocyst O.O.D. Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language