Definition of 'crystal'

Noun

1. a solid formed by the solidification of a chemical and having a highly regular atomic structure
2. a crystalline element used as a component in various electronic devices
3. a rock formed by the solidification of a substance; has regularly repeating internal structure; external plane faces
      Synonyms: crystallization
4. colorless glass made of almost pure silica
      Synonyms: quartz glass quartz vitreous silica lechatelierite
5. glassware made of quartz
6. a protective cover that protects the face of a watch
      Synonyms: watch crystal watch glass

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