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EnglishEdit

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A regular icosahedron

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EtymologyEdit

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

NounEdit

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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