ˈkɹɪstəl k(w)ɔːts k(w)ɔɹts a protective cover that protects the face of a watch glassware made of quartz a crystalline element used as a component in various electronic devices a rock formed by the solidification of a substance; has regularly repeating internal structure; external plane faces colorless glass made of almost pure silica a solid formed by the solidification of a chemical and having a highly regular atomic structure