Dec″a‐gon (?), n. [Pref. deca- + Gr. � a corner or angle: cf. F. décagone.] (Geom.) A plane figure having ten sides and ten angles; any figure having ten angles. A regular decagon is one that has all its sides and angles equal.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.