Decagon

[dekәgәn]

(noun.) a polygon with 10 sides and 10 angles.

Typed by Anatole--From WordNet

(n.) 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.

Editor: Zeke

n. a plane figure of ten angles and sides.—adj. Decag′onal.

Typist: Nola