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triangle (n.)

late 14c., from Old French triangle (13c.), from Latin triangulum "triangle," noun use of neuter of adjective triangulus "three-cornered, having three angles," from tri- "three" (see tri-) + angulus "corner, angle" (see angle (n.)).

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Definitions of triangle from WordNet
1
triangle (n.)
a three-sided polygon;
Synonyms: trigon / trilateral
triangle (n.)
something approximating the shape of a triangle;
the coastline of Chile and Argentina and Brazil forms two legs of a triangle
triangle (n.)
any of various triangular drafting instruments used to draw straight lines at specified angles;
triangle (n.)
a percussion instrument consisting of a metal bar bent in the shape of an open triangle;
2
Triangle (n.)
a small northern constellation near Perseus between Andromeda and Aries;
Synonyms: Triangulum
From wordnet.princeton.edu