1. (

• triangle ,
• trigon ,
• trilateral

) a three-sided polygon ;

2. (

• triangle ,

) something approximating the shape of a triangle; "the coastline of Chile and Argentina and Brazil forms two legs of a triangle" ;

3. (

• Triangulum ,
• Triangle

) a small northern constellation near Perseus between Andromeda and Aries ;

4. (

• triangle ,

) any of various triangular drafting instruments used to draw straight lines at specified angles ;

5. (

• triangle

) a percussion instrument consisting of a metal bar bent in the shape of an open triangle ;