Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Describing a wedge-shaped crystal form of the tetragonal or orthorhombic system.
  • adj. Describing a crystal form bounded by eight scalene triangles arranged in pairs, constituting a tetragonal scalenohedron.
  • n. A polyhedron whose four faces are identical isosceles or scalene triangles.

from The Century Dictionary and Cyclopedia

  • n. A crystalline form of the sphenoid group of the tetragonal system, bound by eight similar isosceles triangles in symmetrical pairs; a tetragonal scalenohedron. See sphenoid, 1.

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