triangulato-|traɪæŋgjʊˈleɪtəʊ|used as combining form of med. or mod.L. triangulātus, triangulate a., in terms of Nat.Hist. denoting a combination of this with another form, as triangulato-ˈexcavate, triangulato-ˈovate, triangulato-subˈovateadjs.1849Dana Geol.App. i. (1850) 714 Very broad triangulato-ovate.1852― Crust. i. 630 This segment is deeply triangulato-excavate posteriorly.