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

nonagon

noun

/ˈnɒnəɡən/

/ˈnɑːnəɡɑːn/

(geometry)

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a flat shape with nine straight sides and nine anglesTopics Colours and Shapesc2
Word Originmid 17th cent.: formed irregularly from Latin nonus ‘ninth’, on the pattern of words such as hexagon.

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