a piece of a solid material with a naturally regular geometrical structure and plane faces that are symmetrically arranged
graphite crystals
any solid chemical substance that has a regularly repeating internal arrangement of atoms or molecules
an electronic component containing crystalline material used as a frequency-determining element
a clear transparent mineral, esp colourless quartz
= crystal ball
a clear colourless glass of superior quality
collectively, articles made of such glass
the family crystal
the transparent cover over a watch or clock dial
[Middle English cristal via Old French and Latinfrom Greek krystallos ice, crystal]