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icosahedron

[ ahy-koh-suh-hee-druhn, ahy-kos-uh- ]

noun

, plural i·co·sa·he·drons, i·co·sa·he·dra [ahy-koh-s, uh, -, hee, -dr, uh, ahy-kos-, uh, -].
  1. a solid figure having 20 faces.


icosahedron

/ ˌaɪkəsəˈhiːdrən /

noun

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


icosahedron

/ ī-kō′sə-hēdrən /

, Plural icosahedrons

  1. A polyhedron having twenty faces.


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Derived Forms

  • ˌicosaˈhedral, adjective
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Other Words From

  • i·cosa·hedral adjective
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Word History and Origins

Origin of icosahedron1

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

Origin of icosahedron1

C16: from Greek eikosaedron, from eikosi twenty + -edron -hedron
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Example Sentences

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.

Two of these generate the cube and the octahedron; five of these generate the dodecahedron and the icosahedron.

The Icosahedron, having twenty equilateral triangles as faces.

Within the earth's orbit inscribe an icosahedron: the sphere inscribed in it will be Venus's orbit.

Now, inscribe in the Earth an icosahedron, the circle inscribed in it will be Venus.

That for the tetrahedron has 12 for its order, for the cube (or octahedron) 24, and for the icosahedron (or dodecahedron) 60.

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iconostasisicositetrahedron