Having 20 equilateral triangular surfaces and 12 vertices, as do most viruses with cubic symmetry. [G. eikosi, twenty, + -edros, having sides or bases]
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ico·sa·he·dral (i″ko-sə-heґdrəl) [Gr. eikosi twenty + hedra seat] pertaining to an icosahedron, a solid having 20 faces and 12 vertices.Medical dictionary. 2011.