acetabulum

Noun
  1. The cup-shaped hollow in the hipbone into which the head of the femur fits to form a ball-and-socket joint (synset 105603979)
    is a type of: socket - a bony hollow into which a structure fits
    is a part of: hipbone, innominate bone - large flaring bone forming one half of the pelvis; made up of the ilium and ischium and pubis
    same as: cotyloid cavity

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