- crystal [kris′təl]n.[altered (modeled on L) < ME & OFr cristal, OE cristalla < L crystallum, crystal, ice < Gr krystallos < kryos: see CRUDE]1.a) a clear, transparent mineral; esp., pure quartzb) a piece of such quartz cut in the form of an ornament2.a) a very clear, brilliant glassb) articles made of this glass, such as goblets, bowls, or other ware☆ 3. the transparent protective covering over the face of a watch4. anything clear and transparent like crystal5. a solidified form of a substance in which the atoms or molecules are arranged in a definite pattern that is repeated regularly in three dimensions: crystals tend to develop forms bounded by definitely oriented plane surfaces that are harmonious with their internal structures: see CRYSTAL SYSTEM6. Radio Elec. a piezoelectric body or plate, as of quartz, used to control very precisely the frequency of an oscillator or as a circuit element in a crystal filter or a body, often of Rochelle salt, used in a transducer, as in a crystal pickup or microphoneadj.1. of or composed of crystal2. like crystal; clear and transparent3. Radio of or using a crystal
English World dictionary. V. Neufeldt. 2014.