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Meaning of crystal system

crys'tal sys"tem

Pronunciation: [key]
— Crystall. Crystall.
  1. any of the six main classifications of crystals and of crystal lattices according to their symmetry: isometric, hexagonal, tetragonal, orthorhombic, monoclinic, and triclinic.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.