# dodecahedron

[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.
1.
a solid figure having 12 faces.
Origin of dodecahedron
1560-1570
1560-70; dodeca- + -hedron
Related forms
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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Examples from the Web for dodecahedron
Historical Examples
• Two of these generate the cube and the octahedron; five of these generate the dodecahedron and the icosahedron.

Annie Besant and Charles W. Leadbeater
• You might as well call it a dodecahedron, or the cube root of minus nothing.'

May Kendall and Andrew Lang
• That for the tetrahedron has 12 for its order, for the cube (or octahedron) 24, and for the icosahedron (or dodecahedron) 60.

• Iamblichus here refers to the dodecahedron inscribed in the sphere.

David Eugene Smith
• A cube would therefore be represented numerically by seven, a dodecahedron by thirteen.

• The rhombic faces of the dodecahedron are often striated parallel to the longer diagonal.

• Cleavage obtains parallel to the dodecahedron, but is imperfect.

• Round it describe a dodecahedron; the circle including this will be Mars.

• The dodecahedron, having twelve regular pentagons (or five-sided figures) as faces.

H. Stanley Redgrove
British Dictionary definitions for dodecahedron

## dodecahedron

/ˌdəʊdɛkəˈhiːdrən/
noun
1.
a solid figure having twelve plane faces. A regular dodecahedron has regular pentagons as faces See also polyhedron
Derived Forms
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for dodecahedron
n.

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
 dodecahedron   (dō'děk-ə-hē'drən)    Plural dodecahedrons or dodecahedraA polyhedron having twelve faces.
The American Heritage® Science Dictionary
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### Difficulty index for dodecahedron

Few English speakers likely know this word

### Word Value for dodecahedron

0
21
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