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heptagon

noun

🔊/ˈheptəɡən/

🔊/ˈheptəɡɑːn/

(geometry几何)

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a flat shape with seven straight sides and seven angles七边形；七角形Topics Colours and Shapesc2
Word Originlate 16th cent.: from Greek heptagonon, neuter (used as a noun) of heptagonos ‘seven-angled’.