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extremely low frequency

noun, Radio.
1.
any frequency between 30 and 300 hertz.
Abbreviation: ELF, elf.
Origin
1965-1970
1965-70
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for extremely low frequency

extremely low frequency

noun
1.
a radio frequency or radio-frequency band below 3 kilohertz ELF
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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