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

nonagon

noun
 
/ˈnɒnəɡən/
 
/ˈnɑːnəɡɑːn/
(geometry)
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  1. 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.
See nonagon in the Oxford Advanced American Dictionary
trait
noun
 
 
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