acetabular,a.|æsɪˈtæbjuːlə(r)| [f. L. acētābul-um + -ar, as if ad. L. *acētābulār-is.] Cup-like, cup-shaped; sucker-shaped. 1849Murchison SiluriaApp. 544 The acetabular hooklets of Cephalopods.1856Woodward Mollusca i. 76 The specimens..show the large acetabular bases of the hooks.