cotyloid joint

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Noun
1. a freely moving joint in which a sphere on the head of one bone fits into a rounded cavity in the other bone
(synonym) ball-and-socket joint, spheroid joint, enarthrodial joint, enarthrosis, articulatio spheroidea
(hypernym) synovial joint, articulatio synovialis, diarthrosis
(hyponym) shoulder, shoulder joint, articulatio humeri