acetabulum — English Dictionary

Noun

1. The bony cup of the hip bone which receives the head of the femur.

   Synonyms

   cotyloid cavity

   Examples

   Holonyms: hip joint; hip bone < pelvis

2. The cavity in which the leg of an insect is inserted at its articulation with the body.

   Synonyms

   cotyle

3. A sucker of the sepia or cuttlefish and related animals.

4. The large posterior sucker of the leeches.

5. One of the lobes of the placenta in ruminating animals.

6. A vinegar saucer, especially (historical) in ancient Roman contexts.

7. A Roman unit of liquid measure reckoned as the volume of 2½ Roman ounces of wine and equivalent to about 66 mL although differing slightly over time.

   Usage

   • Historical

Noun

1. the cup-shaped hollow in the hipbone into which the head of the femur fits to form a ball-and-socket joint

   Synonyms

   cotyloid cavity

   Broader terms

   socket