[doh-dek-uh-hee-druhn, doh-dek-]
noun, plural dodecahedrons, dodecahedra [doh-dek-uh-hee-druh, doh-dek-] . Geometry, Crystallography.
a solid figure having 12 faces.

1560–70; dodeca- + -hedron

dodecahedral, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
dodecahedron (ˌdəʊdɛkəˈhiːdrən)
See also polyhedron a solid figure having twelve plane faces. A regular dodecahedron has regular pentagons as faces

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1570, from Gk. dodeka "twelve" (short for duodeka, from duo "two" + deka "ten") + hedra "seat, base, chair, face of a geometric solid," from PIE base *sed- "to sit" (see sedentary).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
dodecahedron   (dō'děk-ə-hē'drən)  Pronunciation Key 
Plural dodecahedrons or dodecahedra
A polyhedron having twelve faces.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Though that idea has popped up, with some saying the cosmos was a dodecahedron a few years back.
All faces of a regular dodecahedron are congruent, regular pentagons.
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