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extremely low frequency
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noun Radio.
any frequency between 30 and 300 hertz. Abbreviations: ELF, elf
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Origin of extremely low frequency
First recorded in 1965–70
Words nearby extremely low frequency
extremal, extreme, extreme fighting, extremely, extremely high frequency, extremely low frequency, extreme programming, extreme sport, extreme unction, extremism, extremist
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
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
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