| acetabulum | <anatomy> The hollow, cuplike portion of the pelvis into which the head of the thigh bone (femur) fits. <zoology> Also, in entomology, the leg socket on an insect's abdomen or thorax. (12 Mar 1998) |
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| margin of acetabulum | The rim of bone around the acetabulum to which is attached the labrum acetabulare. Synonym: limbus acetabuli, margo acetabularis. (05 Mar 2000) |
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| transverse ligament of acetabulum | Portion of the acetabular labrum that passes across the acetabular notch. Synonym: ligamentum transversum acetabuli. (05 Mar 2000) |
| lunate surface of acetabulum | The curved articular surface that surrounds the acetabular fossa and articulates with the head of the femur. Synonym: facies lunata acetabuli. (05 Mar 2000) |