En″ne‐a‐gon (?; 277), n. [Gr. εννἔα nine + γωνία corner, angle: cf. ennéagone.] (Geom.) A polygon or plane figure with nine sides and nine angles; a nonagon.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.