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1. Oxford American Dictionary

   heptagon

   • IPA[ˈheptəˌɡän]

   美式

   • n.
     a plane figure with seven straight sides and angles.

   • noun: heptagon, plural noun: heptagons

2. • 更多解釋

   heptagon

   • IPA[ˈhɛptəɡ(ə)n]

   英式

   • n.
     a plane figure with seven straight sides and angles.

   Oxford Dictionary