Webster’s Revised Unabridged Dictionary · 1913 Ileac Il′e·ac (ĭl′ē·ăk), a. [See Ileum.] 1. (Anat.) Pertaining to the ileum. [Written also iliac.] 2. See Iliac, 1. [R.] Ileac passion. (Med.) See Ileus. ‹ Ile Ileocæcal ›