What does acetabulum mean?
The definition of acetabulum
Ac`e*tab”u*lum, n.
Etym: [L., a little saucer for vinegar, fr. acetum vinegar, fr. acere to be sour.]

1 (Rom. Antiq.)
A vinegar cup; socket of the hip bone; a measure of about one eighth of a pint, etc.
2 (Anat.)

(a) The bony cup which receives the head of the thigh bone.
(b) The cavity in which the leg of an insect is inserted at its articulation with the body.
(c) A sucker of the sepia or cuttlefish and related animals.
(d) The large posterior sucker of the leeches.
(e) One of the lobes of the placenta in ruminating animals.