icosahedron

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English[edit]

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A regular icosahedron

Alternative forms[edit]

Etymology[edit]

From Ancient Greek εἰκοσάεδρον (eikosáedron), from εἴκοσι (eíkosi, twenty) + ἕδρα (hédra, face of a geometrical solid).

Noun[edit]

icosahedron (plural icosahedra or icosahedrons)

  1. (geometry) A polyhedron with twenty faces.
  2. (geometry, specifically) A regular icosahedron: one of the Platonic solids, all of whose faces are regular (equilateral) triangles

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