Definition from Wiktionary, the free dictionary
First attested in 1656, from Latin octagonos, from Ancient Greek οκτάγωνος (oktágōnos, “eight-angled”), from ὀκτώ (oktṓ, “eight”) + γωνία (gōnía, “angle”). The adjective octagonal was first mentioned from 1571.
octagon (plural octagons)
- (geometry) A polygon with eight sides and eight angles.
- (martial arts, usually capitalized) The arena for mixed martial arts, particularly as trademarked by the UFC.
polygon with eight sides and eight angles