crystal

Noun

• a protective cover that protects the face of a watch

• glassware made of quartz

• colorless glass made of almost pure silica

• a rock formed by the solidification of a substance; has regularly repeating internal structure; external plane faces

• a crystalline element used as a component in various electronic devices

• a solid formed by the solidification of a chemical and having a highly regular atomic structure

Related words

• Synonyms: 
  watch crystal , watch glass , quartz glass , quartz , vitreous silica , lechatelierite , crystallization