from The American Heritage® Dictionary of the English Language, 4th Edition
- n. An extremely dim, short-lived, expanding disk of reddish light found above thunderstorms and believed to be created by electromagnetic pulses from intense lightning.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. an upper atmospheric optical phenomena associated with thunderstorms, rapidly expanding disk-shaped regions of luminosity, lasting less than a thousandth of a second, which occur high above energetic cloud-to-ground lightning of positive or negative polarity
- n. Obsolete form of elf.
from the GNU version of the Collaborative International Dictionary of English
- n. An old form of Elf.
e(mission of) l(ight and) v(ery low-frequency perturbations from) e(lectromagnetic pulse sources).(American Heritage® Dictionary of the English Language, Fourth Edition)