triangle

Universal Words noun 1 a flat shape with three straight sides and three angles; a thing in the shape of a triangle: (BrE) a right-angled triangle * (AmE) a right triangle * Cut the sandwiches into triangles. 2 a simple musical instrument that consists of a metal rod bent into the shape of a triangle, that you hit with another metal rod 3 a situation involving three people in a complicated relationship: a love triangle seealsoETERNALTRIANGLE 4 (AmE) = SETSQUARE