Entry 1 sense Webster, 1913 Acetabular /ă'-sĭ-tăbʹyə-lər/ · Ac·e·tab·u·lar · IPA /ˌæsɪˈtæbjəlɚ/ 01 a. Cup-shaped; saucer-shaped; acetabuliform. 1. Cup-shaped; saucer-shaped; acetabuliform.