dodecahedron

[ doh-dek-uh-hee-druhn, doh-dek- ]

Phonetic (Standard)IPA

noun

, Geometry, Crystallography.

, plural do·dec·a·he·drons, do·dec·a·he·dra [doh-dek-, uh, -, hee, -dr, uh, doh-dek-].

dodecahedron

/ ˌdəʊdɛkəˈhiːdrən /

a solid figure having twelve plane faces. A regular dodecahedron has regular pentagons as faces See also polyhedron

dodecahedron

/ dō′dĕk-ə-hē′drən /

, Plural dodecahedrons

First recorded in 1560–70; dodeca- + -hedron

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

The rhombic dodecahedron is not regular, for though the lines and surfaces are equal, the angles are not.

Two of these generate the cube and the octahedron; five of these generate the dodecahedron and the icosahedron.

The “rhombic dodecahedron,” one of the geometrical semiregular solids, is an important crystal form.

The “ordinary dodecahedron” is one of the Platonic solids (see Polyhedron).

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