Webster's English Dictionary

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triangle

tri.an.gle \'tri--.an-g*l\ n [ME, fr. L triangulum, fr. neut. of triangulus 
   triangular, fr. t]ri- + angulus angle 1: a polygon having three sides  2a: 
   a musical percussion instrument made of a rod of steel bent into the fo rm 
   of a triangle open at one angle 2b: a drafting instrument consisting of a 
   thin flat right-angled triangle o f wood or plastic with acute angles of 45 
   degrees or of 30 degrees and 60 degrees 3: a situation involving the love 
   of two persons of one sex for one of the  opposite sex with the resulting 
   complications {the eternal ~}