extremely low frequency

noun Radio.

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

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Origin of extremely low frequency

First recorded in 1965–70

Words nearby extremely low frequency

extreme programming, extreme sport, extreme unction, extremely, extremely high frequency, extremely low frequency, extremism, extremist, extremitas, extremity, extremophile
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for extremely low frequency

extremely low frequency

noun

a radio frequency or radio-frequency band below 3 kilohertzAbbreviation: 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