il·e·um /ˈɪliəm/
  迴腸
  il·e·um /ˈɪlɪəm/ 名詞
  迴腸
  Il·i·um n.  Anat. The dorsal one of the three principal bones comprising either lateral half of the pelvis; the dorsal or upper part of the hip bone. See Innominate bone, under Innominate. [Written also ilion, and ileum.]
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  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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  ileum
       n : the part of the small intestine between the jejunum and the
           cecum