| gigahertz | (noun) 1,000,000,000 periods per second | Synonyms: Gc, GHz, gigacycle, gigacycle per second |
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| hertz | (noun) the unit of frequency; one hertz has a periodic interval of one second (named for Heinrich Rudolph Hertz) | Synonyms: cps, cycle, cycle per second, cycles/second, Hz |
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| kilohertz | (noun) one thousand periods per second | Synonyms: kc, kHz, kilocycle, kilocycle per second |
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| megahertz | (noun) one million periods per second | Synonyms: Mc, megacycle, megacycle per second, MHz |
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| quartz | (noun) a hard glossy mineral consisting of silicon dioxide in crystal form; present in most rocks (especially sandstone and granite); yellow sand is quartz with iron oxide impurities | - |
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| (noun) colorless glass made of almost pure silica | Synonyms: crystal, lechatelierite, quartz glass, vitreous silica |
| terahertz | (noun) one trillion periods per second | Synonyms: THz |
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