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nonagon

noun
🔊/ˈnɒnəɡən/
🔊/ˈnɑːnəɡɑːn/
 (geometry几何)
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  1. a flat shape with nine straight sides and nine angles九边形；九角形Topics Colours and Shapesc2
    Word Originmid 17th cent.: formed irregularly from Latin nonus ‘ninth’, on the pattern of words such as hexagon.