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crystal system (plural crystal systems)

  1. (crystallography) Any of the seven distinct symmetry classifications of crystals: cubic, tetragonal, hexagonal, orthorhombic, monoclinic, triclinic and trigonal.
    • 1998, Georgina Ferry, Dorothy Hodgkin: A Life:
      The crystal system to which a particular molecule belongs can make a considerable difference to how easy it is to solve.

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