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octagon

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octagon/ˈɑːktəˌgɑːn/noun
pluraloctagons
octagon
/ˈɑːktəˌgɑːn/
noun
pluraloctagons
Learner's definition of OCTAGON  
[count]mathematics
: a flat shape that has eight sides and eight angles
— see picture at geometry

— octagonal

/ɑkˈtægənl̟/adjective
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