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nonagon

noun

no·​na·​gon ˈnō-nə-ˌgän How to pronounce nonagon (audio)
: 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

Word History

Etymology

Latin nonus ninth + English -gon — more at noon

First Known Use

circa 1639, in the meaning defined above

Time Traveler
The first known use of nonagon was circa 1639

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