\Do*dec`a*he"dron\, n. [Gr. ?; ? twelve + ? seat,
bottom, base: cf. F. dod['e]ca[`e]dre.] (Geom. & Crystallog.)
A solid having twelve faces.

Note: The regular dodecahedron is bounded by twelve equal and
      regular pentagons; the pyritohedron (see
      {Pyritohedron}) is related to it; the rhombic
      dodecahedron is bounded by twelve equal rhombic faces.