
1. a clear, transparent mineral or glass resembling ice.
2. the transparent form of crystallized quartz.
3. Chemistry, Mineralogy. a solid body having a characteristic internal structure and enclosed by symmetrically arranged plane surfaces, intersecting at definite and characteristic angles.
4. anything made of or resembling such a substance.
5. a single grain or mass of a crystalline substance.
6. glass of fine quality and a high degree of brilliance.
7. articles, esp. glassware for the table and ornamental objects, made of such a glass.
8. the glass or plastic cover over the face of a watch.
9. Radio.
a. the piece of germanium, silicon, galena, or the like forming the essential part of a crystal detector.
b. the crystal detector itself.
10. Electronics. a quartz crystal ground in the shape of a rectangular parallelepiped, which vibrates strongly at one frequency when electric voltages of that frequency are placed across opposite sides: used to control the frequency of an oscillator (crystal osci
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