A polyhedron with twelve faces, often assumed to be regular. The regular dodecahedron is one of the Platonic solids, and its faces are regular pentagons. It has 20 vertices and 30 edges.
Geology and Earth Sciences
A crystal form composed of twelve rhomb-shaped faces, each face intersecting two of the crystallographic axes and being parallel to the third. It belongs to the cubic (isometric) system.