acetabulum
/ˌæsəˈtæbjʊləm/noun
(pl. acetabula /-lə/)
1- Anatomy the socket of the hip bone, into which the head of the femur fits【剖】髋臼; 关节窝。
1.1
- Zoology any cup-shaped structure, especially a sucker【动】臼状结构（尤指吸盘）。
词源
late Middle English （denoting a vinegar cup, hence a cup-shaped cavity）： from Latin, from acetum 'vinegar' + -abulum, denoting a container.