\Ac`e*tab"u*lum\, n. [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.