A figure or polygon having nine sides and nine angles.
nonagon nonahedron nonuplets
a nonagon has nine sides and nine angles and nine corners. It comes from the Latin word 'nonus' meaning nine.
Because nonagon means 9 sides
Not a regular nonagon.
This is called a nonagon, from the Latin root "nonus" meaning ninth.
A nonagon has nine sides.
"nonagon" is not a prefix.