nonagon
nounCA, US /ˈnɑn.ə.ɡɑn/ · UK /ˈnɒn.ə.ɡən/
Etymology From nona- + -gon.
1
Geometry, Mathematics, Sciences A polygon with nine sides and nine angles; an enneagon.
- Related terms
- nonagonal
Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.