Definition of crystal noun from the Oxford Advanced American Dictionary

     

    crystal

     noun
    noun
    NAmE//ˈkrɪstl//
     
     
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  1. 1[countable] a small piece of a substance with many even sides, that is formed naturally when the substance becomes solid ice/salt crystals
  2. 2[uncountable, countable] a clear mineral, such as quartz, used in making jewelry and decorative objects a pair of crystal earrings
  3. 3[uncountable] glass of very high quality a crystal chandelier/vase Every table had been set with fine china and crystal.
  4. 4 [countable] a piece of glass or plastic that covers the face of a watch see also liquid crystal display
  5. 5= meth
See the Oxford Advanced Learner's Dictionary entry: crystal