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-excavate, -ovate, -subovate adjs.
1849. Dana, Geol., App. 1. (1850), 714. Very broad triangulato-ovate. Ibid. (1852), Crust., I. 630. This segment is deeply triangulato-excavate posteriorly.
