ˈilēəm noun
( plural il·ia -ēə)
Etymology: New Latin, from Latin ilium, ileum, ile groin, viscera — more at ileum
1. : the dorsal and upper one of the three bones composing either lateral half of the pelvis being in man broad and expanded above and narrower below where it joins with the ischium and pubis to form part of the acetabulum
2. archaic : ileum