Definition of heptagon noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈheptəɡən//
; NAmE NAmE//ˈheptəɡɑːn//
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a flat shape with seven straight sides and seven angles Word Origin late 16th cent.: from Greek heptagonon, neuter (used as a noun) of heptagonos ‘seven-angled’.
See the Oxford Advanced American Dictionary entry: heptagon