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octagon

noun
🔊/ˈɒktəɡən/
🔊/ˈɑːktəɡɑːn/
 (geometry几何)
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  1. a flat shape with eight straight sides and eight angles八边形；八角形
    Topics Colours and Shapesc2
    Word Originlate 16th cent.: via Latin from Greek octagōnos ‘eight-angled’.