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quarterstaff
Quartet
quartet
quartic
quartile
quarto
quartz
quartz clock
quartz crystal
quartz glass
quartz heater
quartz-iodine lamp
quartz lamp
quartz watch
quartziferous
quartzite
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quartz crystal

quartz crys·tal (plural quartz crys·tals)


noun 
Definition:
 
quartz piece vibrating at known frequency: a small piece of quartz cut so that it vibrates at a known frequency

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