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English word dodecagon comes from English -gon, English dodeca- (Twelve.)
-gon (English)
(geometry) Forms the names of plane figures containing a given number of angles, and thus bounded by that number of line segments (polygons). If the number is large enough, it can be attached directly to an English numeral with a hyphen.
dodeca- (English)
Twelve.
dodecagon (English)
(geometry) A polygon with twelve edges and twelve angles.