ico·​sa·​he·​dron | \(ˌ)ī-ˌkō-sə-ˈhē-drən, -ˌkä-\
plural icosahedrons or icosahedra\(ˌ)ī-​ˌkō-​sə-​ˈhē-​drə, -​ˌkä-​ \

Definition of icosahedron 

: a polyhedron having 20 faces

Examples of icosahedron in a Sentence

Recent Examples on the Web

The immersive experience took place under a giant version of their icosahedron logo, which — Odesza explained in a Reddit thread — represents their genre and style versatility. Susie Schmank, Indianapolis Star, "Odesza sets the bar high for White River concert season, despite chilly conditions," 30 Apr. 2018 They are defined by symmetry, and the Greeks knew that there were only five possibilities meeting the criteria: the tetrahedron, cube, octahedron, dodecahedron and icosahedron. Eugenia Cheng, WSJ, "Lessons of the Möbius Bagel," 10 Aug. 2017 The icosahedron is made from 20 identical equilateral triangles and seemed to exist nowhere except in mathematicians’ imaginations. Eugenia Cheng, WSJ, "Lessons of the Möbius Bagel," 10 Aug. 2017

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

See More

First Known Use of icosahedron

1570, in the meaning defined above

History and Etymology for icosahedron

Greek eikosaedron, from eikosi twenty + -edron -hedron — more at vigesimal

Keep scrolling for more

Learn More about icosahedron

Share icosahedron

Statistics for icosahedron

Look-up Popularity

Time Traveler for icosahedron

The first known use of icosahedron was in 1570

See more words from the same year

More from Merriam-Webster on icosahedron

Britannica English: Translation of icosahedron for Arabic Speakers

Britannica.com: Encyclopedia article about icosahedron

Comments on icosahedron

What made you want to look up icosahedron? Please tell us where you read or heard it (including the quote, if possible).


living or existing for a long time

Get Word of the Day daily email!

Test Your Vocabulary

Late Autumn 2018 Words of the Day Quiz

  • frosted-autumn-leaves
  • Which is a synonym of yahoo?
True or False

Test your knowledge - and maybe learn something along the way.


Test Your Knowledge - and learn some interesting things along the way.


Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!