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acetabulum

ac·e·tab·u·lum

acetabulum

 
pronunciation:
ae sih tae by lm
part of speech: noun
definition 1: the cup-shaped socket of the hipbone into which the top of the thighbone fits.
definition 2: any of the suction cups on the arms of an octopus, or similar appendages, as on leeches or certain fish.
derivation: acetabular (adj.)