#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
  subtype:  hip_socket  tooth_socket  acetabulum
  part of:  bone__os  rigid connective tissue that makes up the skeleton of vertebrates
     part of:  endoskeleton  the internal skeleton; bony and cartilaginous structure (especially of vertebrates)

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