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| an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle. |
| the offspring of a zebra and a donkey. |
acetabulum ac·e·tab·u·lum (ās'ĭ-tāb'yə-ləm)
n. pl. ac·e·tab·u·la (-lə)
The cup-shaped cavity at the base of the hipbone into which the ball-shaped head of the femur fits. Also called cotyloid cavity.