Definition of ileum in English:


Pronunciation /ˈilēəm/ /ˈɪliəm/


  • The third portion of the small intestine, between the jejunum and the cecum.

    • ‘The midgut eventually develops into distal duodenum, jejunum, ileum, caecum, appendix, ascending colon, and proximal two thirds of the transverse colon.’
    • ‘The latter might be a confusion with ileum, the third portion of the small intestine.’
    • ‘Ultimately, the shunts were converted to jejunoileostomies in which the upper portion of the jejunum was anastomosed to the lower portion of the ileum.’
    • ‘Approximately 90% of the fluid contained in the ileum (ie, distal portion of the small intestine) is absorbed in the colon.’
    • ‘The patient was treated with surgical resection of the distal jejunum, proximal ileum, and the 3 nodules of the liver.’


Late 17th century from medieval Latin, variant of ilium.



/ˈilēəm/ /ˈɪliəm/