- ball-and-socket joint, spheroid joint, cotyloid joint, enarthrodial joint, enarthrosis, articulatio spheroidea - a freely moving joint in which a sphere on the head of one bone fits into a rounded cavity in the other bone
--1 is a kind of synovial joint, articulatio synovialis, diarthrosis
--1 has particulars:shoulder, shoulder joint, articulatio humeri; hip, hip joint, coxa, articulatio coxae