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

icosahedron

/ ī-kō′sə-hē′drən /

, Plural icosahedrons

1. A polyhedron having twenty faces.

Derived Forms

• ˌicosaˈhedral, adjective

Other Words From

• i·cosa·hedral adjective

Word History and Origins

Origin of icosahedron¹

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

Word History and Origins

Origin of icosahedron¹

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

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.

From Quanta Magazine

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

From Project Gutenberg

The Icosahedron, having twenty equilateral triangles as faces.

From Project Gutenberg

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

From Project Gutenberg

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

From Project Gutenberg

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

From Project Gutenberg