/ Dictionary / Index V vitelline membrane: Meaning and Definition of Find definitions for: vitel'line mem'brane Pronunciation: [key] the membrane surrounding the egg yolk. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. vitelline vitellogenesis Related Content Daily Word Quiz: clairvoyant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language