from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A polyhedron with 12 faces.

from The Century Dictionary.

  • noun In geometry, a solid having twelve faces. Also duodecahedron.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Geom. & Crystallog.) A solid having twelve faces.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun geometry A polyhedron with twelve faces; the regular dodecahedron has regular pentagons as faces and is one of the Platonic solids.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun any polyhedron having twelve plane faces


from The American Heritage® Dictionary of the English Language, 4th Edition

[Greek dōdekaedron, from neuter of Greek dōdekaedros, having twelve sides : dōdeka, twelve; see dodecagon + -edros, sided; see -hedron.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Ancient Greek δωδεκάεδρον.


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  • Constructing these is just totally awesome. I demonstrated it out of Euclid last year; basically you just mark off golden sections on a cube, raise equal lines perpendicularly, and connect the dots. I even made a model.

    August 16, 2008

  • Constructing? Just saying this is teh alsome!

    August 16, 2008

  • It is often referred to by lower forms of life as a 'D12'.

    August 16, 2008

  • Has anyone here read 'The Phantom Tollbooth'? The dodecahedron was one of my favorite characters when I read it as a kid.

    November 19, 2008

  • Yes, there are references to it at octopus, inner thesaurus and hippopotamonomatopoeia. But no one has made a Tollboth list yet . . .

    November 19, 2008

  • Don't jump to Conclusions!

    November 19, 2008