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heptagon (n.)

1560s, from French heptagon, from Greek heptagonon, from hepta "seven" (see septi-) + gōnia "angle, corner" (from PIE root *genu- (1) "knee; angle"). Related: Heptagonal.

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Definitions of heptagon from WordNet

heptagon (n.)
a seven-sided polygon;
From wordnet.princeton.edu