Work in progress:
triangle
• noun 1 a plane figure with three straight sides and three angles. 2 something in the form of a triangle. 3 a musical instrument consisting of a steel rod bent into a triangle, sounded with a rod. 4 an emotional relationship involving a couple and a third person with whom one of them is involved.
— ORIGIN Latin triangulum, from tri- ‘three’ + angulus ‘corner’.
