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English definition of “ball-and-socket joint”

ball-and-socket joint

noun [C] uk   specialized us  
a joint (= a place where two bones are connected) consisting of a round end and a hollow socket that fit together and move easily: The hip joint is a ball-and-socket joint.
(Definition of ball-and-socket joint from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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