icosahedron
English edit
Alternative forms edit
Etymology edit
From Ancient Greek εἰκοσάεδρον (eikosáedron), from εἴκοσι (eíkosi, “twenty”) + ἕδρα (hédra, “face of a geometrical solid”). Equivalent to icosa- + -hedron.
Pronunciation edit
Noun edit
icosahedron (plural icosahedra or icosahedrons)
- (geometry) A polyhedron with twenty faces.
- (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 edit
Related terms edit
Translations edit
a polyhedron
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regular icosahedron
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