icosahedron

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English

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A regular icosahedron

Alternative forms

Etymology

From Ancient Greek εἰκοσάεδρον (eikosáedron), from εἴκοσι (eíkosi, “twenty”) + ἕδρα (hédra, “face of a geometrical solid”). Equivalent to icosa- +‎ -hedron.

Pronunciation

  • IPA(key): /ˌaɪkoʊsəˈhiːdɹən/, /ˌaɪkɒsəˈhiːdɹən/, /ˌaɪkɔsəˈhiːdɹən/

Noun

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
    Synonym: regular gyroelongated pentagonal bipyramid

Derived terms

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Translations

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