/ Dictionary / Index Z zona pellucida: Meaning and Definition of Find definitions for: zo•na pel•lu•ci•da Pronunciation: (zō'nu pu-l'si-du, pel-y'-), [key] — pl. zo•nae pel•lu•ci•dae the transparent, noncellular layer surrounding the ovum of mammals, often having radial striations. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. zonal geranium zonate Related Content Daily Word Quiz: eureka Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language