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extremely low frequency

noun

, Radio.
  1. any frequency between 30 and 300 hertz. : ELF, elf


extremely low frequency

noun

  1. a radio frequency or radio-frequency band below 3 kilohertz ELF


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Word History and Origins

Origin of extremely low frequency1

First recorded in 1965–70

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petrichor

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extremely high frequencyextreme programming