Webster’s Revised Unabridged Dictionary · 1913
Triangulate
Tri·an′gu·late, v. t. [imp. & p. p. Triangulated; p. pr. & vb. n. Triangulating.] 1. To divide into triangles; specifically, to survey by means of a series of triangles properly laid down and measured.
2. To make triangular, or three-cornered.