Nine-sided outline (7)

I believe the answer is:

nonagon

(Other definitions for nonagon that I've seen before include "geometric figure" , "Figure with nine sides" , "Nine-sided shape" , "Nine-sided polygon" , "regular figure" .)

I've seen this clue in The Mirror.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.