Acetabulum
WordNet
noun
(1) The cup-shaped hollow in the hipbone into which the head of the femur fits to form a ball-and-socket joint
WiktionaryText
Etymology
, from , from
Noun
- a vinegar cup;
- the socket of the hipbone;
- a measure of about one eighth of a pint
- The bony cup which receives the head of the thigh bone.
- The cavity in which the leg of an insect is inserted at its articulation with the body.
- A sucker of the sepia or cuttlefish and related animals.
- The large posterior sucker of the leeches.
- One of the lobes of the placenta in ruminating animals.