[ ahy-koh-suh-hee-druh n, ahy-kos-uh- ]
/ aɪˌkoʊ səˈhi drən, aɪˌkɒs ə- /

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.

Origin of icosahedron

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

Related forms

i·co·sa·he·dral, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for icosahedron


/ (ˌaɪkəsəˈhiːdrən) /

noun plural -drons or -dra (-drə)

a solid figure having 20 faces. The faces of a regular icosahedron are equilateral triangles

Derived Forms

icosahedral, adjective

Word Origin for icosahedron

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

Science definitions for icosahedron


[ ī-kō′sə-hēdrən ]

Plural icosahedrons icosahedra

A polyhedron having twenty faces.

Related forms

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