Source : Webster's Revised Unabridged Dictionary (1913)

Acetabular \Ac`e*tab"u*lar\, a.
   Cup-shaped; saucer-shaped; acetabuliform.

Source : WordNet®

acetabular
     adj : of the cup-shaped socket that receives the head of the thigh
           bone [syn: {cotyloid}, {cotyloidal}]