OCTAGON

octagon

(noun) an eight-sided polygon

Source: WordNet® 3.1

Etymology

Noun

octagon (plural octagons)

(geometry, also, attributively) A polygon with eight sides and eight angles.

(martial arts) Often in the form Octagon: the arena for mixed martial arts.

Source: Wiktionary

Oc"ta*gon, n. Etym: [Gr. cctogone.]

1. (Geom.)

Definition: 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.

Source: Webster’s Unabridged Dictionary 1913 Edition