Icosahedron definition

ī-kōsə-hēdrən, ī-kŏsə-
A polyhedron having 20 faces.
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A polyhedron having twenty faces.
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(geometry) A polyhedron with twenty faces.
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(geometry, specifically) A regular icosahedron: one of the Platonic solids, all of whose faces are regular (equilateral) triangles.
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A solid figure with twenty plane surfaces.
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Other Word Forms

Noun

Singular:
icosahedron
Plural:
icosahedra, icosahedrons

Origin of icosahedron

  • Greek eikosaedron from neuter of Greek eikosaedros twenty-sided eikosi twenty wīkm̥tī- in Indo-European roots -edros -sided –hedron

    From American Heritage Dictionary of the English Language, 5th Edition

  • From Ancient Greek εἰκοσάεδρον (eikosaedron), from εἴκοσι (eikosi, “twenty”) + ἕδρα (hedra, “face of a geometrical solid”).

    From Wiktionary