GNU Collaborative International Dictionary of English

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1.       
   ‖Acetabulum , n. [L., a little saucer for vinegar, fr. acetum vinegar, fr. acere to be sour.]
   1913 Webster
   (Rom. Antiq.) A vinegar cup; socket of the hip bone; a measure of about one eighth of a pint, etc.
   1913 Webster
   (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.
   1913 Webster