Definition of "acetabulum"

(anatomy) The bony cup of the pelvis which receives the head of the femur.  examples

(zootomy) The cavity in which the leg of an insect is inserted at its articulation with the body.  examples

(zootomy) A sucker of the sepia or cuttlefish and related animals.  examples

(zootomy) The large posterior sucker of the leeches.  examples

(zootomy) One of the lobes of the placenta in ruminating animals.  examples

(historical) in ancient Roman contexts.

(historical) A Roman unit of liquid measure reckoned as the volume of 2½ Roman ounces of wine and equivalent to about 66 mL although differing slightly over time.