The hip bone is comprised of the three parts; the ilium, pubis and ischium. Prior to puberty, the triradiate cartilage separates these parts – and fusion. The hip bone (os coxae, innominate bone, pelvic bone or coxal bone) is a large flat bone, constricted in the center and expanded above and below. Hip bone definition is - the large flaring bone that constitutes a lateral half of the pelvis in mammals and is composed of the ilium, ischium. Either of two large, flat bones, each forming one of the outer borders of the pelvis in mammals and consisting of the fused ilium, ischium, and pubis. The. Either of two large flat bones each forming one of the lateral halves of the pelvis and consisting of the fused ilium, ischium, and pubis. ()Here are the lumbar vertebrae, the pelvis, and the two femurs. We'll look at the pelvis by pelvis is made up of the two hip bones. Hipbone meaning · Either of two large flat bones each forming one of the lateral halves of the pelvis and consisting of the fused ilium, ischium, and pubis. pelvis, also called bony pelvis or pelvic girdle, in human anatomy, basin-shaped complex of bones that connects the trunk and the legs, supports and. Ilium. The broad, flaring portion of the hip bone (the crest of the pelvis). · Pubis. The lower, posterior part of the hip bone. · Ischium. One of the bones that. The hip joint is the articulation of the pelvis with the femur, The adult os coxae, or hip bone, is formed by the fusion of the ilium.