/ Dictionary / Index I islet of Langerhans: Meaning and Definition of Find definitions for: is'let of Lang'er•hans Pronunciation: (läng'ur-häns", -hänz", läng'gur-), [key] — Anat. Anat. any of several masses of endocrine cells in the pancreas that secrete insulin, somatostatin, and glucagon. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. islet cell adenoma Islington 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