"triangle" in the noun sense
1. triangle, trigon, trilateral
a three-sided polygon
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
any of various triangular drafting instruments used to draw straight lines at specified angles
a percussion instrument consisting of a metal bar bent in the shape of an open triangle
Source: WordNet® (An amazing lexical database of English)
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