acuminating,ppl.a.|əˈkjuːmɪneɪtɪŋ| [f. as prec. + -ing2.] Rising or tapering to a point. 1804Jameson Mineral. I. 213 The acuminating planes form truncations on the angles.1850Dana Geol.App. i. 694 The approximated and acuminating apices of the beaks.