D defs.my
Entry 2 senses Webster, 1913

Acetabulum

· Ac·e·tab·u·lum · IPA /ˌæs.əˈtæb.jəl.əm/
01 n. A vinegar cup; socket of the hip bone; a measure of about one eighth of a pint, etc.
  1. 1.
    A vinegar cup; socket of the hip bone; a measure of about one eighth of a pint, etc.(Rom. Antiq.)
  2. 2.
    The bony cup which receives the head of the thigh bone.(Anat.)