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