the cup-shaped hollow in the hipbone into which the head of the femur fits to form a ball-and-socket joint
The area on the pelvis that is capable of becoming a hip socket In newborns this area is cartilage, as the child matures this area will ossify or harden into bone Sometimes also called the area of triradiate cartilage because three bones come together to form the acetabulum
: The cavity in which the leg of an insect is inserted at its articulation with the body