noun the large posterior sucker of the leeches.
2. acetabulum ·noun one of the lobes of the placenta in ruminating animals.
3. acetabulum ·noun the bony cup which receives the head of the thigh bone.
4. acetabulum ·noun a sucker of the sepia or cuttlefish and related animals.
5. acetabulum ·noun a vinegar cup; socket of the hip bone; a measure of about one eighth of a pint, ·etc.
6. acetabulum ·noun the cavity in which the leg of an insect is inserted at its articulation with the body.