crystal
n 1: a solid formed by the solidification of a chemical and
having a highly regular atomic structure
2: a crystalline element used in various electronic devices
3: a rock formed by the solidification of a substance; has
regularly repeating internal structure; external plane
faces
4: colorless glass made of almost pure silica [syn: {quartz
glass}, {quartz}, {vitreous silica}, {lechatelierite}]
5: glassware made of quartz
6: a protective cover that protects the face of a watch [syn: {watch
crystal}, {watch glass}]