Definition of octagon in English:


Line breaks: octa|gon
Pronunciation: /ˈɒktəg(ə)n


  • 1A plane figure with eight straight sides and eight angles.
    More 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 an octagonal plan or cross section.
    More 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: /-ˈtag(ə)n(ə)l/
More example sentences
  • This beautiful 11-ft, octagonal gazebo looks great in any setting.
  • Their excavations unearthed a large octagonal fortress with 10-foot thick walls and eight towers.
  • And here she was in a suburban Minnesota pool, churning the humid air with those octagonal Slavic consonants.


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

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