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

 

hendecagon

 noun
noun
BrE BrE//henˈdekəɡən//
 
; NAmE NAmE//henˈdekəɡən//
 
(geometry)
 
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a flat shape with eleven straight sides and eleven angles Word Origin early 18th cent.: from hendeca- ‘eleven’ + -gon, on the pattern of words such as polygon.
See the Oxford Advanced American Dictionary entry: hendecagon