Entry 1 sense Webster, 1913 Acetable /ăsʹĭtəbəl/ · Ac·e·ta·ble · IPA /ˈæ.sɪ.tə.bəl/ 01 n. An acetabulum; or about one eighth of a pint. 1. An acetabulum; or about one eighth of a pint.[Obs.]