extremely low frequency
noun Radio.
any frequency between 30 and 300 hertz. Abbreviation: ELF, elf
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
British Dictionary definitions for extremely low frequency
extremely low frequency
noun
a radio frequency or radio-frequency band below 3 kilohertz
Abbreviation: ELF