nonagon

noun
no·​na·​gon | \ˈnō-nə-ˌgän \

Definition of nonagon 

: a polygon of nine angles and nine sides

First Known Use of nonagon

circa 1639, in the meaning defined above

History and Etymology for nonagon

Latin nonus ninth + English -gon — more at noon

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The first known use of nonagon was circa 1639

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