#acetabulum__cotyloid_cavity  the cup-shaped hollow in the hipbone into which the head of the femur fits to form a ball-and-socket joint
  supertype:  socket.bodily_cavity  a bony hollow into which a structure fits
  part of:  hipbone__innominate_bone__innominatebone  large flaring bone forming one half of the pelvis; made up of the ilium and ischium and pubis
     part of:  pelvis__pelvic_girdle__pelvic_arch__hip  the structure of the vertebrate skeleton supporting the lower limbs in humans and the hind limbs or corresponding parts in other vertebrates
        part of:  appendicular_skeleton  the part of the skeleton that includes the pectoral girdle and the pelvic girdle and the upper and lower limbs
           part of:  endoskeleton  the internal skeleton; bony and cartilaginous structure (especially of vertebrates)

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