The Collaborative International Dictionary
Pentagon \Pen"ta*gon\, n. [Gr. ?; ? (see Penta-) + gwni`a angle: cf. L. pentagonium, F. pentagone.] (Geom.) 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.
Usage examples of "regular pentagon".
Now I wonder, said Quintesetz, if you see that almost regular pentagon of almost equally bright stars.
The dodecahedron was, to these ancient mathematicians, the most mysterious of the solids: it was by far the most difficult to construct, the accurate drawing of the regular pentagon necessitating a rather elaborate application of PYTHAGORAS' great theorem.
Nyahua stepped back from the regular pentagon, breaking the symmetry and indicated with his arm, rumbling quietly.
She knew something was going wrong, though, by the faint snorts in the room and how her associate, a regular Pentagon reporter, groaned, then subtly shifted away from her.