nonagenarian, nonagon, nonahedron, nonane, nonomino, nonuplet
Nonagon
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nona- is the prefix meaning 9
* nonagon * nonagenarian
A nine sided two dimensional shape would be called a nonagon. Nona is a common prefix meaning nine of something.
September. it uses the prefix 'Sept,' Latin for seven, as it was at one point the seventh month in the year. And Septagon is not a word in the English language. The correct name for a 7-sided polygon is "heptagon." It is derived from "hepta," the Greek word for "seven."
The prefix is dodeca- which, in Greek, refers to 12.