octagon

First attested in 1656, from Latin octagonos, from Ancient Greek ὀκτάγωνος (oktágōnos, “eight-angled”), from ὀκτώ (oktṓ, “eight”) + γωνία (gōnía, “angle”). 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)

1. (geometry) A polygon with eight sides and eight angles.
2. (martial arts, usually capitalized) The arena for mixed martial arts, particularly as trademarked by the UFC.

• octagonal