Apedia

Octagon Oc‧Ta‧Gon ˈɒktəɡən ˈɑːktəɡɑːn Noun Countable Flat Shape

Front octagon
Back oc‧ta‧gon /ˈɒktəɡən $ ˈɑːktəɡɑːn/ noun [countable]
a flat shape with eight sides and eight angles
—octagonal /ɒkˈtæɡənəl $ ɑːk-/ adjective:
an octagonal tower

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