either of the two bones that form the sides of the pelvis, consisting of three fused components, the ilium, ischium, and pubis
Nontechnical name: hipbone
innominate bone in American English
either of the two large, irregular bones that, together with the sacrum and coccyx, make up the pelvis: it is formed of three bones, the ilium, ischium, and pubis,which become fused in the adult