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Definition of heptagon noun from the Oxford Advanced American Dictionary

 

heptagon

 noun
noun
NAmE//ˈhɛptəˌɡɑn//
 
(geometry)
 
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a flat shape with seven straight sides and seven angles
heptagonal
 
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NAmE//hɛpˈtæɡənl//
 
adjectiveSee heptagon in the Oxford Advanced Learner's Dictionary
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