WordWeight : Weighing the Words

Pronunciation : Il"e*um
Part of Speech : n.
Etymology : [L. ile, ileum, ilium, pl. ilia, groin, flank.]
Definition : 1. (Anat.)

Defn: 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.)

Defn: See Ilium. [R.]

Note: Most modern writers restrict ileum to the division of the intestine and ilium to the pelvic bone.
Source : Webster's Unabridged Dictionary, 1913