First attested in 1656, from Latin octagonos, from Ancient Greek ὀκτάγωνος (oktágōnos, “eight-angled”), from ὀκτώ (oktṓ, “eight”) + γωνία (gōnía, “angle”). Equivalent to octa- + -gon. The adjective octagonal was first mentioned from 1571.
- (US) enPR: ŏk'təgŏn, IPA(key): /ˈɒk.tə.ɡɒn/
- (UK) enPR: ŏk'təgən, IPA(key): /ˈɒk.tə.ɡən/
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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.