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trun·cate / ˈtrəngˌkāt/ • v. [tr.] [often as adj.] (truncated) shorten (something) by cutting off the top or the end: a truncated cone shape discussion was truncated by the arrival of tea. ∎  Crystallog. replace (an edge or an angle) by a plane, typically so as to make equal angles with the adjacent faces. • adj. Bot. & Zool. (of a leaf, feather, or other part) ending abruptly as if cut off across the base or tip. DERIVATIVES: trun·ca·tion / ˌtrəngˈkāshən/ n.