Oc″ta‐gon (?), n. [Gr. � eight-cornered; οκτἀ- (for οκτὤ eight) + � an angle: cf. F. cctogone.] 1. (Geom.) A plane figure of eight sides and eight angles.
2. Any structure (as a fortification) or place with eight sides or angles.
Regular octagon, one in which the sides are all equal, and the angles also are all equal.