octagon

A polygon with eight sides and eight angles.

A gold coin of octagonal shape, of the value of 50 dollars, issued in 1851 by the United States assay-office in San Francisco.

In geometry, a figure of eight angles and eight sides. When the sides and angles are equal, it is a regular octagon.

In fortification, a work with eight bastions.

A plane figure of eight sides and eight angles.

Any structure (as a fortification) or place with eight sides or angles.

one in which the sides are all equal, and the angles also are all equal.

A polygon with eight sides and eight angles.

The arena for mixed martial arts, particularly as trademarked by the UFC.

an eight-sided polygon