WordReference Random House Unabridged Dictionary of American English © 2026
extreme′ly low′ fre′quency, [Radio.]
  1. Electronics, Radio and Televisionany frequency between 30 and 300 hertz. Abbr.: ELF, elf
  • 1965–70

'extremely low frequency' also found in these entries (note: many are not synonyms or translations):
elf

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