ball-and-socket joint

Từ điển WordNet v3.1 - WordNet Dictionary

noun

1. a freely moving joint in which a sphere on the head of one bone fits into a rounded cavity in the other bone
• Syn:
spheroid joint, cotyloid joint, enarthrodial joint, enarthrosis, articulatio spheroidea
• Hypernyms:
synovial joint, articulatio synovialis, diarthrosis
• Hyponyms:
shoulder, shoulder joint, articulatio humeri, hip, hip joint,
coxa, articulatio coxae
2. a joint that can rotate within a socket
• Hypernyms:
joint
• Part Meronyms:
socket