American English

Definition of octagon noun from the Oxford Advanced American Dictionary

 

octagon

 noun
noun
NAmE//ˈɑktəˌɡɑn//
 
(geometry)
 
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a flat shape with eight straight sides and eight angles
NAmE//ɑkˈtæɡənl//
 
adjective an octagonal coin
See the Oxford Advanced Learner's Dictionary entry: octagon