ball–and–socket joint noun
: an articulation (as the hip joint) in which the rounded head of one bone fits into a cuplike cavity of the other and admits movement in any direction—called also enarthrosis
Illustration of BALL-AND-SOCKET JOINT
Seen & Heard
What made you want to look up ball-and-socket joint? Please tell us where you read or heard it (including the quote, if possible).