#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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