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Definition of: acetabulum
(as′ə·tab′yə·ləm) noun plural ·la (-lə)
1. Anat. The socket in the hip in which the head of the femur rests and revolves.
2. A sucker, as on a tapeworm, leech, or other invertebrate.
3. Any of the depressions in an insect's exoskeleton into which a leg fits. [<L, (a small vinegar cup < acetum vinegar]
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