Definition of octagon noun from the Oxford Advanced Learner's Dictionary

 

octagon

 noun
noun
BrE BrE//ˈɒktəɡən//
 
; NAmE NAmE//ˈɑːktəɡɑːn//
 
(geometry)
 
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a flat shape with eight straight sides and eight angles Word Origin late 16th cent.: via Latin from Greek octagōnos ‘eight-angled’.
See the Oxford Advanced American Dictionary entry: octagon