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| tri·an·gle [ tr àng g'l ] (plural tri·an·gles) |
noun |
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| Definition: |
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1. 3-sided figure: a two-dimensional geometric figure formed of three sides and three angles. The triangle is a fundamental figure of plane geometry, since it is the polygon with the fewest sides and any other polygon can be subdivided into triangles.
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2. object with 3 sides: something shaped like a triangle
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3. drafting instrument for ruling lines: any thin flat three-sided instrument used as a drawing and drafting guide to rule straight lines at specific angles or for determining the angle of ruled lines. Typically the instruments have angles of 90°, 45°, 60°, and 30°.
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4. 3-person relationship: an emotional or sexual relationship involving three people.
See also eternal triangle
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5. music percussion instrument: a metal bar bent into the shape of a triangle with one angle open, used as a percussion instrument
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| [14th century. Directly or via French< Latin triangulum< triangulus "three-cornered"] |
