Definition of octagon in English:



  • 1A plane figure with eight straight sides and eight angles.

    • ‘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.’
    • ‘Each vertex triangle of the octagon is a vertex triangle of one such parallelogram.’
    • ‘If you think of an octagon as a square with its corners cut off, you'll realize how simple the shape truly is.’
    • ‘The octagon, suggests Perrin, was chosen for its resonance with the baptistries of the ancient and gothic worlds.’
    • ‘The octagon is the symbol of the meeting between heaven and earth because it is a compromise half way between a square and a circle.’
    • ‘When the four flat pages are folded out, they form an octagon.’
    • ‘We can go ahead and bend the octagon into three dimensions to get an idea of the topology generated by this tiling of the hyperbolic plane.’
    • ‘The place was shaped like an octagon, the second floor merely a balcony over the first, large fiberglass pillars supporting the platform.’
    • ‘The octagon represents one of the three sacred treasures of the Japanese imperial court: the sacred mirror.’
    • ‘A bout in the controversial sport takes place in an octagon shaped ring surrounded by wire mesh.’
    • ‘It was an odd octagon shape with large windows along the five outer walls.’
    • ‘It was a building taller than another in the city, in the shape of an octagon, but with circular shafts on each corner.’
    1. 1.1An object or building with an octagonal plan or cross section.
      • ‘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.’
      • ‘The heavy, stiff octagon barrel has a lot to do with this.’
      • ‘At any given fight, Leon's on one side of the octagon, I'm on the other.’
      • ‘The medallion itself was an octagon with curved sides and a yin-yang symbol, but now it was glowing along with the animal orbs.’
      • ‘This can be repeated to transform the octagon into a sixteen-sided figure on which the base of the dome may rest.’
      • ‘Discarded pieces from games may turn up stars, triangles or octagons.’
      • ‘A group of paper octagons followed the cloth pieces.’
      • ‘The main center block and the octagons at each end were built between 1860 and 1862.’
      • ‘He glared savagely at the ball in his hands; the black octagons were marred by the white powder of the ceiling.’
      • ‘The octagon is then placed on the white stand, where it is fixed into a star formation with the help of a metal bracket.’
      • ‘The burger's much smaller now, chiselled into a rough octagon.’
      • ‘Even more astonishing is his chapel, designed by Einhard on the basis of the mystic octagon.’
      • ‘Goodbye to the quaint packaging, goodbye to the fruit-and-nut delight, and so-long to the vanilla octagon.’
      • ‘That octagon in the background is one of the Cuban clinics.’
      • ‘The Chicago studio had an octagon room with sketches on the walls.’
      • ‘The magazine tube holds 10 rounds and the tapered octagon barrel is 20 inches long.’
      • ‘The octagon coffee table in the middle of the room was covered with a round doily and a vase of fresh flowers in the center.’
      • ‘To make a tapered octagon barrel involves an expensive custom made fixture.’


Late 16th century via Latin from Greek octagōnos ‘eight-angled’.