triangletri‧an‧gle /ˈtraɪˌæŋgəl/ ●●● noun [countable] 
1
math, geometry a flat shape with three straight sides and three anglesTHESAURUSshape, square, circle, semicircle, rectangle, oval► see thesaurus at shape12eng. lang. arts a small musical instrument shaped like a triangle, that you play by hitting it with a small metal bar [Origin: 1300–1400 Latin triangulum, from tri- “three” + angulus “angle”]
1 math, geometry a flat shape with three straight sides and three anglesTHESAURUSshape, square, circle, semicircle, rectangle, oval► see thesaurus at shape12eng. lang. arts a small musical instrument shaped like a triangle, that you play by hitting it with a small metal bar [Origin: 1300–1400 Latin triangulum, from tri- “three” + angulus “angle”]
