Nonagon is the appropriate word for a nine sided plane figure
The word is, surprisingly, "nonagon".
nonagon is one good word
Nonagonal.
nonaligned?
November
nonagon nonahedron nonuplets
Polygon, for many-sided.
nonagon
nonagon
Nonagenerian - somebody that is 90 or between 90 and 100 years old. prefix for nonagon
nonagon
nonagon