ball-and-socket joint

详细解释:【医】 球窝关节, 杵臼关节

英语解释：

名词 ball-and-socket joint:

a freely moving joint in which a sphere on the head of one bone fits into a rounded cavity in the other bone同义词：spheroid joint, cotyloid joint, enarthrodial joint, enarthrosis, articulatio spheroidea