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Definition of ball-and-socket joint noun from the Oxford Advanced Learner's Dictionary

ball-and-socket joint

noun
 
/ˌbɔːl ən ˈsɒkɪt dʒɔɪnt/
 
/ˌbɔːl ən ˈsɑːkɪt dʒɔɪnt/
(anatomy)
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  1. a joint such as the hip joint at the top of the leg, in which a piece of bone in the shape of a ball moves inside a curved hollow part
See ball-and-socket joint in the Oxford Advanced American Dictionary
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adjective
 
 
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