Canon agonises somewhat to reveal figure

• Nine-sided shape
• Nine sided object
• Geometric figure
• Many-sided figure
• Its internal angles total 1,260 degrees
• Figure a small number continue to badger
• It has nine angles and nine sides
• Odd-shaped figure

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Nonagon \Non"a*gon\, n. [L. nonus ninth + Gr. ? angle.] (Math.) A plane figure or polygon having nine sides and nine angles.

Wiktionary Word definitions in Wiktionary
n. (context geometry English) A polygon with nine sides and nine angles.