octagon

== English == === Alternative forms === octogon (obsolete) === Etymology === From Latin octagōnon, octōgōnon (“octagon”), and from its etymon Ancient Greek ὀκτάγωνον (oktágōnon, “octagon”), probably from Koine Greek ὀκτάγωνος (oktágōnos, “having eight corners”) + -ον (-on, suffix forming nouns). ὀκτάγωνος is derived from ὀκτᾰ- (oktă-, prefix meaning ‘eight’) (from ὀκτώ (oktṓ, “eight”), ultimately from Proto-Indo-European *oḱtṓw (“eight”)) + γωνία (gōnía, “angle; corner”) (probably ultimately from Proto-Indo-European *ǵónu (“knee”)); analysable as octa- +‎ -gon. The English word is cognate with Middle French octogone (modern French octogone), Italian octagono (obsolete), ottagono, Spanish octágono, octógono. Sense 2 (“arena for mixed martial arts”) refers to its shape. === Pronunciation === (Received Pronunciation) enPR: ŏk'təgən, IPA(key): /ˈɒktəɡ(ə)n/ (General American) enPR: ŏk'təgŏn, IPA(key): /ˈɑktəˌɡɑn/ Hyphenation: oc‧ta‧gon === 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. ==== Synonyms ==== 8-gon ==== Derived terms ==== octagonal octagonally ==== Translations ==== === References === === Further reading === octagon on Wikipedia.Wikipedia The Octagon, Dunedin on Wikipedia.Wikipedia