Definition of quartz
1
: a mineral consisting of silicon dioxide occurring in colorless and transparent or colored hexagonal crystals or in crystalline masses
2
: a quartz crystal that when placed in an electric field oscillates at a constant frequency and is used to control devices which require precise regulation
a quartz watch
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Merriam-Webster unabridged
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Time Traveler for quartz
The first known use of quartz was circa 1631
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