from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. an irregular dodecahedron, consisting of identical but irregular pentagons
  • n. the shape of a crystal of pyrite

from the GNU version of the Collaborative International Dictionary of English

  • n. The pentagonal dodecahedron, a common form of pyrite.

from The Century Dictionary and Cyclopedia

  • n. In crystallography, a pentagonal dodecahedron (see dodecahedron); a solid contained by twelve pentagons: a common form with pyrite, whence the name. It is the hemihedral form of the tetrahexahedron.


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