decagon

noun

deca·​gon ˈde-kə-ˌgän How to pronounce decagon (audio)
: a plane polygon of 10 angles and 10 sides

Illustration of decagon

Illustration of decagon

Examples of decagon 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.
Their atoms arrange themselves into chains of pentagons, decagons and other shapes to form patterns that never quite repeat. Patchen Barss, Quanta Magazine, 18 Aug. 2025

Word History

Etymology

New Latin decagonum, from Greek dekagōnon, from deka- deca- + -gōnon -gon

First Known Use

circa 1639, in the meaning defined above

Time Traveler
The first known use of decagon was circa 1639

Browse Nearby Words

Cite this Entry

“Decagon.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/decagon. Accessed 9 Sep. 2025.

Kids Definition

decagon

noun
deca·​gon ˈdek-ə-ˌgän How to pronounce decagon (audio)
: a polygon of 10 angles and 10 sides
Last Updated: - Updated example sentences
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