Icosahedron - Definitions from Dictionary.com

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i·co·sa·he·dron

Audio Help [ahy-koh-suh-hee-druh

n, ahy-kos-uh-] Pronunciation Key

–noun, plural -drons, -dra

Audio Help [-druh] Pronunciation Key.

a solid figure having 20 faces.

[Origin: 1560–70; < Gk eikosáedron, equiv. to eikosa- (var. of eikosi-, comb. form of eíkosi twenty) + -edron -hedron

]

—Related forms

i·co·sa·he·dral, adjective

Dictionary.com Unabridged (v 1.1)
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i·co·sa·he·dron Audio Help (ī-kō'sə-hē'drən, ī-kŏs'ə-) Pronunciation Key

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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
Copyright © 2006 by Houghton Mifflin Company.
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