American Heritage® Dictionary of the English Language, Fourth Edition
- n. A radio frequency in the range from 30 to 300 kilohertz.
- n. a pitch that is perceived as below other pitches
- n. 30 to 300 kilohertz
“Essentially," Harper said, "it's a series of very low frequency radio receivers near the North Pole that listen to the sounds of the earth – plasma wave emissions from the northern lights, broadband pulses from lightning storms, that sort of thing.”
“Fathoms below, a sickening low frequency rumble resonated upward through the water as the gigantic submerged sheet began scraping its way back up the face of the glacier.”
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