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Definition of hendecagon noun from the Oxford Advanced Learner's Dictionary

hendecagon

noun

/henˈdekəɡən/

/henˈdekəɡɑːn/

(geometry)

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a flat shape with eleven straight sides and eleven anglesTopics Colours and Shapesc2
Word Originearly 18th cent.: from hendeca- ‘eleven’ + -gon, on the pattern of words such as polygon.

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