Definitions

1. 1.triangle (polygon with three sides and three angles)
2. 2.triangle (triangular-shaped object)
3. 3.triangle (three elements that make up something)
4. 4.triangle (percussion instrument made by forming a metal rod into a triangular shape which is open at one angle; it is suspended from a string and hit with a metal bar to make a resonant sound)
5. 5.rack (hollow triangle used for aligning the balls at the start of a pool game)
6. 6.threeway, threesome, throuple, ménage à trois (sexual activity involving three people)

Forms