Pentagon
Pronunciation : Pen"ta*gon
Part of Speech : n.
Etymology : [Gr. Penta-) + gwni`a angle: cf. L. pentagonium, F. pentagone.] (Geom.)
Definition : Defn: A plane figure having five angles, and, consequently, five sides; any figure having five angles. Regular pentagon, a pentagon in which the angles are all equal, and the sides all equal.
Source : Webster's Unabridged Dictionary, 1913