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 ;