/ ˈnɒnəgən; NAmE ˈnɑːnəgɑːn/ noun
( geometry ) a flat shape with nine straight sides and nine angles
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WORD ORIGIN
mid 17th cent.: formed irregularly from Latin nonus ninth, on the pattern of words such as hexagon .
/ ˈnɒnəgən; NAmE ˈnɑːnəgɑːn/ noun
( geometry ) a flat shape with nine straight sides and nine angles
••
WORD ORIGIN
mid 17th cent.: formed irregularly from Latin nonus ninth, on the pattern of words such as hexagon .
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005