Nōn'a-gōn, n.
n. [Fr. nonagone, from Lat. novem, nine, nonus, the ninth, and Gr. γωνία, corner, angle. See ENNEAGON.] (Math.) A plane figure or polygon having nine sides and nine angles.
n. [Fr. nonagone, from Lat. novem, nine, nonus, the ninth, and Gr. γωνία, corner, angle. See ENNEAGON.] (Math.) A plane figure or polygon having nine sides and nine angles.