Quartz-crystal definition

A small crystal of quartz accurately cut along certain axes so that it can be vibrated at a particular frequency, used for its piezoelectric properties to produce an electric signal of constant known frequency.
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Any of several crystalline forms of quartz.
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(electronics) A thin, natural or synthetic, piezoelectric crystal of silicon dioxide cut and ground to a precise thickness so as to vibrate at a particular frequency when supplied with energy.
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