cotyloid : Idioms & Phrases
cotyloid cavity
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noun the cup-shaped hollow in the hipbone into which the head of the femur fits to form a ball-and-socket joint
acetabulum.
WordNet
cotyloid joint
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noun a freely moving joint in which a sphere on the head of one bone fits into a rounded cavity in the other bone
enarthrodial joint; enarthrosis; spheroid joint; ball-and-socket joint; articulatio spheroidea.