/ Dictionary / Index I ileocolostomy: Meaning and Definition of Find definitions for: il•e•o•co•los•to•my Pronunciation: (il"ē-ō-ku-los'tu-mē), [key] — pl. -mies. the surgical formation of an artificial opening between the ileum and the colon. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ileocolitis ileostomy 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