The Collaborative International Dictionary of English v.0.48:

Iliac \Il"i*ac\, a. [L. Iliacus, Gr. ?. See Iliad.]
   Pertaining to ancient Ilium, or Troy. --Gladstone.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Ileac \Il"e*ac\, a. [See Ileum.]
   1. (Anat.) Pertaining to the ileum. [Written also iliac.]
      [1913 Webster]

   2. See Iliac, 1. [R.]
      [1913 Webster]

   Ileac passion. (Med.) See Ileus.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Iliac \Il"i*ac\, a. [Cf. F. iliaque. See Ileum, and cf. Jade
   a stone.]
   1. (Anat.) Pertaining to, or in the region of, the ilium, or
      dorsal bone of the pelvis; as, the iliac artery. [Written
      also ileac.]
      [1913 Webster]

   2. See Ileac, 1. [R.]
      [1913 Webster]

   Iliac crest, the upper margin of the ilium.

   Iliac passion. See Ileus.

   Iliac region, a region of the abdomen, on either side of
      the hypogastric regions, and below the lumbar regions.
      [1913 Webster]

WordNet (r) 3.0 (2006):

iliac
    adj 1: of or relating to the ilium