Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of nonagon is as below...

Enneagon :: Enneagon (n.) A polygon or plane figure with nine sides and nine angles; a nonagon.

Enheahedron :: Enheahedron (n.) A figure having nine sides; a nonagon.

Nonagon :: Nonagon (n.) A figure or polygon having nine sides and nine angles.

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