Definitions

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.

Etymologies

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)

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