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