nounpl. -·la or -·lums
- Anat. the cup-shaped socket of the hipbone, into which the head of the thighbone fits
- any suction disc of flukes, leeches, cephalopods, etc.
- the cavity into which an insect's leg fits
Origin of acetabulumL, origin, originally , vinegar cup from acetum (see aceto-) + -abulum, diminutive of -abrum, receptacle