very low frequency
ve·ry·lowf·requency
noun
1.
3 to 30 kilohertz
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WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.
ve·ry·lowf·requency
3 to 30 kilohertz
WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.