Il·e·um n.
 1. Anat. The last, and usually the longest, division of the small intestine; the part between the jejunum and large intestine. [Written also ileon, and ilium.]
 2. Anat. See Ilium. [R.]
 Note: ☞ Most modern writers restrict ileum to the division of the intestine and ilium to the pelvic bone.

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