What does "nonagon" mean?

A polygon with nine sides and nine angles; an enneagon.

What is a synonym for "nonagon"?

Common synonyms include: enneagon, nine, nine sided polygon, nonage, novena.

Pronounced //ˈnɑn.ə.ɡɑn//.

/ˈnɑn.ə.ɡɑn/ noun

noun ·Rare ·Advanced level

Noun

"A nonagon, sometimes called an enneagon, is a polygon with nine sides."

From nona- + -gon.