icosahedron

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

Phonetic (Standard)IPA

noun

, plural i·co·sa·he·drons, i·co·sa·he·dra [ahy-koh-s, uh, -, hee, -dr, uh, ahy-kos-, uh, -].

icosahedron

/ ˌaɪkəsəˈhiːdrən /

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

icosahedron

/ ī-kō′sə-hē′drən /

, Plural icosahedrons

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

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

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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