Definition of octagon in English:

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Pronunciation: /ˈäktəˌɡän/
Pronunciation: /ˈäktəˌɡən/


1A plane figure with eight straight sides and eight angles.
Example sentences
  • You may know about a pentagon, a hexagon, or an octagon.
  • You'll find that the interior angle of a regular octagon is 135 degrees.
  • They considered a square, a rectangle, even an octagon.
1.1An object or building with a plan or cross section of this shape.
Example sentences
  • The house is formed of four octagons and no rectangular shapes or flat walls.
  • The octagon is formed by a kind of train-track motif that jogs around a flower-blossom design.
  • Only a handful of gunsmiths have the ability to cut a tapered octagon barrel.



Pronunciation: /äkˈtaɡənəlē/


Late 16th century: via Latin from Greek octagōnos 'eight-angled'.

For editors and proofreaders

Syllabification: oc·ta·gon

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