What does ball-and-socket joint mean?
• BALL-AND-SOCKET JOINT (noun) The noun BALL-AND-SOCKET JOINT has 2 senses: 1. a freely moving joint in which a sphere on the head of one bone fits into a rounded cavity in the other bone 2. a joint that can rotate within a socket Familiarity information: BALL-AND-SOCKET JOINT used as a noun is rare.