#socket.bodily_cavity  a bony hollow into which a structure fits
  supertype:  bodily_cavity__cavity__cavum  (anatomy) a natural hollow or sinus within the body
  part of:  bone
  subtype:  hip_socket__hipsocket  the socket part of the ball-and-socket joint between the head of the femur and the innominate bone
  subtype:  tooth_socket__toothsocket__alveolus  a bony socket in the alveolar ridge that holds a tooth
  subtype:  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

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