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hendecagon

noun
🔊/henˈdekəɡən/
🔊/henˈdekəɡɑːn/
 (geometry几何)
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  1. a flat shape with eleven straight sides and eleven angles十一边形；十一角形Topics Colours and Shapesc2
    Word Originearly 18th cent.: from hendeca- ‘eleven’ + -gon, on the pattern of words such as polygon.