American Heritage Dictionary
(3)
Century Dictionary
(5)
GNU Webster's 1913
(2)
WordNet
(1)
Elsewhere on the web
The round, well buttressed acetabulum is notched with a pit for the ligamentum teres.— PLoS ONE Alerts: New Articles
For instance, when Schreyer came to the hospital, she had fractured her acetabulum, which is where the femur meets the pelvis to form the hip joint.— J. Weekly
The labrum is a piece of cartilage that goes around the mouth of the acetabulum, which is a cup.
The pathology occurs when the head and / or neck of the femur (the acetabular edge) collides or impacts with the pelvic cavity (acetabulum) where this femoral head articulates.— Health News from Medical News Today
"[61 A less formidable proceeding may be useful in cases where the acetabulum is diseased, but not deeply.— A Manual of the Operations of Surgery For the Use of Senior Students, House Surgeons, and Junior Practitioners

American Heritage Dictionary (1)
Century Dictionary (1)
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