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extremely low frequency

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extremely low frequency

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

Origin:
1965–70
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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extremely low frequency  
n.   Abbr. ELF
A radio frequency below 300 hertz.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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