noun
- Folklore) fairies that are somewhat mischievous.
- Below 3 kilohertz.
- synonyms: extremely low frequency, ELF
- An acronym for emissions of light and very low frequency perturbations due to electromagnetic pulse sources; extremely bright extremely short (less than a msec) electrical flashes forming a huge ring (up to 400 km diameter. in the ionosphere).
WordNet 3.0 © 2006 by Princeton University
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