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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

They are the dominant culture — and filmgoers who have never clutched a 20-sided icosahedron are subject to their throw of the dice.

Continental Drift is Earth in miniature, mapped onto a truncated icosahedron — a soccer ball — with its regular patchwork of 12 pentagonal faces and 20 hexagonal faces.

There, he can sit and admire it along with the rest of a collection that includes work from real artists, such as the 80-inch infinity light icosahedron sculpture by L.A.’s Anthony James.

Many researchers initially questioned Shechtman’s findings, because it is mathematically impossible to fill space using only icosahedrons.

More precisely, the structure is about 0.7 nanometres across and is a truncated icosahedron — a polyhedron that has 12 pentagonal and 20 hexagonal faces.

From Nature

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iconostasisicositetrahedron