n. [ Pref. deca- + Gr. &unr_; 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. [ 1913 Webster ]
n. [ Gr. &unr_; twelve + &unr_; angle: cf. F. dodécagone. ] (Geom.) A figure or polygon bounded by twelve sides and containing twelve angles. [ 1913 Webster ]
n. [ Gr. &unr_; eleven + &unr_; angle: cf. F. hendécagone. ] (Geom.) A plane figure of eleven sides and eleven angles. [ Written also endecagon. ] [ 1913 Webster ]
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