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triangular

adjective
 
 
/traɪˈæŋ.ɡjʊ.lər/ US  /-lɚ/

Definition

shaped like a triangle: a triangular plot of land The play is performed on a triangular stage.Geometrical shapesSpherical, circular and annular objects
(Definition of triangular adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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