/ Dictionary / Index A auditory vesicle: Meaning and Definition of Find definitions for: au'ditory ves'icle Pronunciation: [key] — Embryol. Embryol. the pouch that is formed by the invagination of an ectodermal placode and that develops into the internal ear. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. auditory phonetics audit trail Related Content Daily Word Quiz: languid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language