disphenoid

  1. Adjective.  (mineralogy) Describing a wedge-shaped crystal form of the tetragonal or orthorhombic system.
  2. Adjective.  (mineralogy) Describing a crystal form bounded by eight scalene triangles arranged in pairs, constituting a tetragonal scalenohedron.
  3. Noun.  (geometry) A polyhedron whose four faces are identical isosceles or scalene triangles.

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This entry was last updated on RefTopia from its source on 3/20/2012.