1. (noun) a three-sided polygon

• trigon
• trilateral

2. (noun) a small northern constellation near Perseus between Andromeda and Aries

• triangulum

1. (noun) a three-sided polygon

• acute triangle
• acute-angled triangle
• cuneus
• wedge
• wedge shape
• equiangular triangle
• equilateral triangle
• isosceles triangle
• oblique triangle
• obtuse triangle
• obtuse-angled triangle
• right triangle
• right-angled triangle
• scalene triangle

1. (noun) a three-sided polygon

• polygon
• polygonal shape

2. (noun) something approximating the shape of a triangle

• form
• shape

3. (noun) any of various triangular drafting instruments used to draw straight lines at specified angles

• drafting instrument

4. (noun) a percussion instrument consisting of a metal bar bent in the shape of an open triangle

• percussion instrument
• percussive instrument

1. (noun) a three-sided polygon

• three-sided
• triangular
• trilateral
• triangular
• triangulate
• triangulate