nonagon
noun
no·na·gon ˈnō-nə-ˌgän 
: a polygon of nine angles and nine sides
Example Sentences
Recent Examples on the Web The cylindrical core is a dull metallic silver with several irregular nonagon fuel assemblies arranged in its center. 
Daniel Oberhaus, Wired, 15 May 2020
Daniel Oberhaus, Wired, 15 May 2020 Word History
Etymology
Latin nonus ninth + English -gon — more at noon
First Known Use
circa 1639, in the meaning defined above
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