/ Dictionary / Index I ileus: Meaning and Definition of Find definitions for: il•e•us Pronunciation: (il'ē-us), [key] — n. Pathol. intestinal obstruction characterized by lack of peristalsis and leading to severe colicky pain and vomiting. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: ileus (Thesaurus) ileum ilex Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language