icosahedron

i·co·sa·he·dron Audio Help (ī-kō'sə-hē'drən, ī-kŏs'ə-)

n. pl. i·co·sa·he·drons or i·co·sa·he·dra (-drə)
A polyhedron having 20 faces.

[Greek eikosaedron : eikosi, twenty; see wīktī- in Indo-European roots + -edron, -hedron.]
i·co'sa·he'dral (-drəl) adj.

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The American Heritage® Dictionary of the English Language, Fourth Edition
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