noun, plural do·dec·a·he·drons, do·dec·a·he·dra [doh-dek-uhhee-druh, doh-dek-] /doʊˌdɛk əˈhi drə, ˌdoʊ dɛk-/. Geometry, Crystallography.

  1. a solid figure having 12 faces.


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

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).

Plural dodecahedrons dodecahedra

  1. A polyhedron having twelve faces.

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