[ahy-koh-suh-hee-druhn, ahy-kos-uh-]
noun, plural icosahedrons, icosahedra [ahy-koh-suh-hee-druh, ahy-kos-uh-] .
a solid figure having 20 faces.

1560–70; < Greek eikosáedron, equivalent to eikosa- (variant of eikosi-, combining form of eíkosi twenty) + -edron -hedron

icosahedral, adjective
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World English Dictionary
icosahedron (ˌaɪkəsəˈhiːdrən)
n , pl -drons, -dra
a solid figure having 20 faces. The faces of a regular icosahedron are equilateral triangles
[C16: from Greek eikosaedron, from eikosi twenty + -edron-hedron]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
icosahedron   (ī-kō'sə-hē'drən)  Pronunciation Key 

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Plural icosahedrons or icosahedra
A polyhedron having twenty faces.

icosahedral adjective
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
All faces of a regular icosahedron are congruent, equilateral triangles.
For example, the icosahedron is created using regular triangles while the hexahedron is made out of squares.
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