Etymology
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polygon (n.)

in geometry, "a plane figure with numerous angles," 1570s, from Late Latin polygonum, from Greek polygōnon, noun use of neuter of adjective polygōnos "many-angled," from polys "many" (from PIE root *pele- (1) "to fill") + -gōnos "angled," from gōnia "angle, corner" (from PIE root *genu- (1) "knee; angle"). Related: Polygonal.

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Definitions of polygon

polygon (n.)
a closed plane figure bounded by straight sides;
Synonyms: polygonal shape
From wordnet.princeton.edu