oc·​ta·​gon | \ ˈäk-tə-ˌgän How to pronounce octagon (audio) \

Definition of octagon

: a polygon of eight angles and eight sides

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Other Words from octagon

octagonal \ äk-​ˈta-​gə-​nᵊl How to pronounce octagonal (audio) \ adjective
octagonally \ äk-​ˈta-​gə-​nᵊl-​ē How to pronounce octagonally (audio) \ adverb

Examples of octagon in a Sentence

Recent Examples on the Web

Swapping in a polygon with more sides, such as an octagon, generates negative curvature, like a doughnut’s interior. New York Times, "‘The logic of the weave’," 29 July 2019 Three days earlier, Newell was in Las Vegas, standing just outside the UFC octagon while training Justin Sumter, a middleweight who was fighting for a UFC contract on Dana White’s Contender Series TV show. Jonah Dylan, courant.com, "One-handed MMA fighter Nick Newell of Milford isn’t done chasing dreams yet," 18 July 2019 Lawrence's all-around ability makes him a blur in the octagon, thus the fitting Tornado moniker. Robert Rimpson, The Courier-Journal, "MMA fighter Lance 'The Tornado' Lawrence is one fight away from his UFC dream," 12 July 2019 From the point of view of hyperbolic geometry, the shapes in Figure 4 are all regular octagons with straight edges. Quanta Magazine, "Getting Into Shapes: From Hyperbolic Geometry to Cube Complexes and Back," 2 Oct. 2012 The brawl came after Nurmagomedov scaled the octagon to launch an attack on McGregor's team after defeating the Irishman to maintain his unbeaten 27-0 record last year. Bijan Hosseini, CNN, "Khabib Nurmagomedov to fight Dustin Poirier after suspension ends," 5 June 2019 The upper four tiers are round with plain white icing and a simple ribbon, while the base tier is an octagon shape decorated with ivy sugar work and the couple's initials in a gold cursive script. Tamara Abraham, Harper's BAZAAR, "Your First Look at Princess Eugenie's Red Velvet Wedding Cake," 6 Oct. 2018 Mark Clement of MyFixItUpLife built this octagon firewood organizer in a couple hours using 2 x 6 cedar. Timothy Dahl, Popular Mechanics, "How to Build a Stylish Octagonal Firewood Rack," 22 Sep. 2016 Afterward, Cormier called out a cageside Brock Lesnar, who entered the octagon and immediately shoved the new champ. Steven Marrocco, USA TODAY, "Daniel Cormier takes heavyweight title from Stipe Miocic at UFC 226, now 2-division champ," 8 July 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'octagon.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of octagon

1594, in the meaning defined above

History and Etymology for octagon

Latin octagonum, from Greek oktagōnon, from okta- + -gōnon -gon

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Statistics for octagon

Last Updated

7 Aug 2019

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Time Traveler for octagon

The first known use of octagon was in 1594

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English Language Learners Definition of octagon

mathematics : a flat shape that has eight sides and eight angles


oc·​ta·​gon | \ ˈäk-tə-ˌgän How to pronounce octagon (audio) \

Kids Definition of octagon

: a flat geometric figure with eight angles and eight sides

More from Merriam-Webster on octagon

Spanish Central: Translation of octagon

Nglish: Translation of octagon for Spanish Speakers

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