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icosahedron

[ ahy-koh-suh-hee-druhn, ahy-kos-uh- ]
/ aɪˌkoʊ səˈhi drən, aɪˌkɒs ə- /
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noun, plural i·co·sa·he·drons, i·co·sa·he·dra [ahy-koh-suh-hee-druh, ahy-kos-uh-]. /aɪˌkoʊ səˈhi drə, aɪˌkɒs ə-/.

a solid figure having 20 faces.

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Origin of icosahedron

1560–70; <Greek eikosáedron, equivalent to eikosa- (variant of eikosi-, combining form of eíkosi twenty) + -edron-hedron
i·co·sa·he·dral, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

British Dictionary definitions for icosahedron

icosahedron
/ (ˌaɪkəsəˈhiːdrən) /

noun plural -drons or -dra (-drə)

a solid figure having 20 faces. The faces of a regular icosahedron are equilateral triangles
icosahedral, adjective
C16: from Greek eikosaedron, from eikosi twenty + -edron -hedron
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for icosahedron

icosahedron
[ ī-kō′sə-hēdrən ]

Plural icosahedrons icosahedra

A polyhedron having twenty faces.
icosahedral adjective
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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