Joint, acetabular

Joint, acetabular: The hip joint by another name. The acetabulum is the cup-shaped socket of the hip joint. It is a key feature of the pelvic anatomy. The head (upper end) of the femur (the thighbone) fits right into the acetabulum, articulates with it, and thereby forms a ball-and-socket joint, the largest in the human body.

The term "acetabulum" is appropriate because in Latin it is a cup, a vinegar cup.