/ Dictionary / Index I islet cell adenoma: Meaning and Definition of Find definitions for: is'let cell" adeno'ma Pronunciation: [key] insulinoma. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. islet islet of Langerhans Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language