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[doh-dek-uh-hee-druh n, doh-dek-] /doʊˌdɛk əˈhi drən, ˌdoʊ dɛk-/
noun, plural dodecahedrons, dodecahedra
[doh-dek-uh-hee-druh, doh-dek-] /doʊˌdɛk əˈhi drə, ˌdoʊ dɛk-/ (Show IPA).
Geometry, Crystallography.
a solid figure having 12 faces.
Origin of dodecahedron
First recorded in 1560-70; dodeca- + -hedron
Related forms
dodecahedral, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for dodecahedron


a solid figure having twelve plane faces. A regular dodecahedron has regular pentagons as faces See also polyhedron
Derived Forms
dodecahedral, adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for dodecahedron

1560s, from Greek dodeka "twelve" (short for duodeka, from duo "two" + deka "ten;" cf. dozen) + hedra "seat, base, chair, face of a geometric solid," from PIE root *sed- (1) "to sit" (see sedentary).

Online Etymology Dictionary, © 2010 Douglas Harper
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dodecahedron in Science
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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