- noun a small slice of a quartz crystal which vibrates at a specific frequency when an electrical voltage is supplied, used as a very accurate clock signal for computers and other high precision timing applications
- A clock which incorporates a quartz-crystal oscillator, whose natural oscillation frequency determines the accuracy of the timepiece. Such a clock can have an analog or digital display, and may have an error of less than 0.1 second per year. Also called quartz crystal clock, or crystal clock.
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