1. A solid formed by the solidification of a chemical and having a highly regular atomic structure
   "She admired the perfect geometry of the salt crystal"
    
2. A rock formed by the solidification of a substance; has regularly repeating internal structure; external plane faces
   "The geode was lined with beautiful quartz crystals";
   - crystallization
    
3. A crystalline element used as a component in various electronic devices
   "The radio relied on a quartz crystal for precise frequency control"
    
4. Colourless glass made of almost pure silica
   "The fine crystal glasses sparkled on the dining table";
   - quartz glass, quartz, vitreous silica, lechatelierite
    
5. Glassware made of quartz
   "She served wine in elegant crystal glasses"
    
6. A protective cover that protects the face of a watch
   "He replaced the scratched watch crystal with a new one";
   - watch crystal, watch glass
    
7. [informal] An amphetamine derivative (trade name Methedrine) used in the form of a crystalline hydrochloride; used as a stimulant to the nervous system and as an appetite suppressant
   "crystal meth abuse has become a serious problem in many communities";
   - methamphetamine, methamphetamine hydrochloride, Methedrine, meth [informal], deoxyephedrine, chalk [informal], crank [informal], glass [informal], ice [informal], shabu [Asia, informal], trash [informal], tik [S.Africa], crystal meth

Derived forms: crystals

Type of: amphetamine, component, constituent, controlled substance, element, glassware, glasswork, natural glass, pep pill [informal], protection, protective cover, protective covering, rock, solid, speed [informal], stone, upper [informal]

Part of: crystal counter, crystal detector, crystal microphone, crystal mike, crystal pickup, ticker [informal], watch

Encyclopedia: Crystal, NV