Nonagenarian, nonagon, nonagesimal, nonagonal.
Nonagonal.
A nonagon is polygon with nine sides. Architectural objects with a shape of a nonagon are the U.S. Steel Tower and the Temples of Baha'i Faith. The logo for the band, "Slipknot" is a version of a nonagon.
A nine-sided object is known as a nonagon.
it is called a nonagon.
An object with nine corners (and therefore nine sides) is a nonagon.
nonagon
Because nonagon means 9 sides
Not a regular nonagon.
A nonagon has nine sides.
A nonagon
"nonagon" is not a prefix.