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polygon

noun [C]
 
 
/ˈpɒl.ɪ.ɡɒn/ US  /ˈpɑː.lɪ.ɡɑːn/ specialized

Definition

a flat shape with three or more straight sides: Triangles and squares are polygons.Geometrical shapesSpherical, circular and annular objects
(Definition of polygon noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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