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BNC: 27464 COCA: 28158
octagon
noun [C] maths /ˈɒktəɡən/
singularoctagon
pluraloctagons
  1. a shape with eight straight sides 八边形;八角形
     Synonyms and related words
    Shapes with many angles: chevron, cross, cube...

derived word

octagonal

/ɒkˈtæɡən(ə)l/ adjective
 Synonyms and related words
Shaped like a specific object: arched, circular, conical...
BNC: 27464 COCA: 28158
BNC: 27464 COCA: 28158

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