octagon

noun

oc·​ta·​gon ˈäk-tə-ˌgän How to pronounce octagon (audio)
: a polygon of eight angles and eight sides
octagonal adjective
octagonally adverb

Examples of octagon in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Sean Strickland left everything in the octagon at the Prudential Center in Newark, New Jersey on Saturday night, upsetting Khamzat Chimaev to be named UFC middleweight champion once again for his career. Scott Thompson, FOXNews.com, 10 May 2026 Representing Spain and Georgia, Topuria has carried, from the beginning, a mission that goes beyond the octagon—one that now stands as tall as Miami’s skyline. Jorge Ebro may 6, Miami Herald, 6 May 2026 All of Raphael’s portraits in the octagon are quite distinct—the palette ranges from emerald green and cinnabar to earthy browns and bone black—but there is one bizarre consistency. Zachary Fine, New Yorker, 20 Apr. 2026 And perhaps most maddeningly, eight does not equal six, and this AI slop displays an octagon, not a hexagon! Big Think, 15 Apr. 2026 See All Example Sentences for octagon

Word History

Etymology

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

First Known Use

1594, in the meaning defined above

Time Traveler
The first known use of octagon was in 1594

Browse Nearby Words

Cite this Entry

“Octagon.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/octagon. Accessed 17 May. 2026.

Kids Definition

octagon

noun
oc·​ta·​gon ˈäk-tə-ˌgän How to pronounce octagon (audio)
: a polygon with eight angles and eight sides
octagonal adjective

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