Meaning of “polygon” in the English Dictionary

"polygon" in American English

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polygonnoun [ C ]

us /ˈpɑl·ɪˌɡɑn/

geometry a flat shape with three or more straight sides:

Triangles and squares are polygons.
polygonal
noun [ C ] /pə·ˈliɡ·ə·nəl/ geometry

(Definition of “polygon” from the Cambridge Academic Content Dictionary © Cambridge University Press)