pyritohedron (pir it ohed ron)

Gr. πυρίτης, pyrites, + έδρα, a seat, base.] In crystal., 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 tetra hexahedron. pyritology (pir-i-tol'ō-ji), n. [NL., Pyritohedron. [ πυρίτης , pyrites, + -λογία, λέγειν , speak: see- ology .] 1. Facts or information relating to pyrites. 2. A system of or treatise on blowpipe analysis.