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

OTHER WORDS FROM icosahedron

i·co·sa·he·dral, adjective

Words nearby icosahedron

iconology, iconomatic, iconophile, iconoscope, iconostasis, icosahedron, icositetrahedron, ICQ, ICS, ICSH, ICSI

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use icosahedron in a sentence

That is, he thought where there’s water, you’d need to be able to arrange copies of the icosahedral water particle such that the icosahedra perfectly occupied the entirety of the watery space without overlapping.
Undergraduates Hunt for Special Tetrahedra That Fit Together|Kevin Hartnett|February 9, 2021|Quanta Magazine
Two of these generate the cube and the octahedron; five of these generate the dodecahedron and the icosahedron.
Occult Chemistry|Annie Besant and Charles W. Leadbeater
The Icosahedron, having twenty equilateral triangles as faces.
Bygone Beliefs|H. Stanley Redgrove
Within the earth's orbit inscribe an icosahedron: the sphere inscribed in it will be Venus's orbit.
The Life of Galileo Galilei, with Illustrations of the Advancement of Experimental Philosophy|John Elliot Drinkwater Bethune

Now, inscribe in the Earth an icosahedron, the circle inscribed in it will be Venus.
The Life of Galileo Galilei, with Illustrations of the Advancement of Experimental Philosophy|John Elliot Drinkwater Bethune
That for the tetrahedron has 12 for its order, for the cube (or octahedron) 24, and for the icosahedron (or dodecahedron) 60.
Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 6|Various

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

Derived forms of icosahedron

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

Scientific definitions for icosahedron

icosahedron

[ ī-kō′sə-hē′drən ]

Plural icosahedrons icosahedra

A polyhedron having twenty faces.

Other words from icosahedron

icosahedral adjective