Definition of polygonal adjective from the Oxford Advanced Learner's Dictionary

 

polygonal

 adjective
adjective
BrE BrE//pəˈlɪɡənl//
 
; NAmE NAmE//pəˈlɪɡənl//
 
(geometry)
 
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(of a flat shape) having at least three straight sides and angles, and usually five or more