|—n , pl -la|
|1.||the deep cuplike cavity on the side of the hipbone that receives the head of the thighbone|
|2.||a round muscular sucker in flatworms, leeches, and cephalopod molluscs|
|3.||the aperture in the thorax of an insect that holds the leg|
|[Latin: vinegar cup, hence a cuplike cavity, from acētum vinegar + -abulum, suffix denoting a container]|
acetabulum ac·e·tab·u·lum (ās'ĭ-tāb'yə-ləm)
n. pl. ac·e·tab·u·la (-lə)
The cup-shaped cavity at the base of the hipbone into which the ball-shaped head of the femur fits. Also called cotyloid cavity.