资料来源 : pyDict

九角形

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Enneagon \En"ne*a*gon\ (?; 277), n. [Gr. ? nine + corner, angle:
   cf. enn['e]agone.] (Geom.)
   A polygon or plane figure with nine sides and nine angles; a
   nonagon.