'Enneagon' definitions:
Definition of 'Enneagon'
From: GCIDE
- Enneagon \En"ne*a*gon\ (?; 277), n. [Gr. 'enne`a nine + gwni`a corner, angle: cf. enn['e]agone.] (Geom.) A polygon or plane figure with nine sides and nine angles; a nonagon. [1913 Webster]