elve definition by American Heritage Dictionary
The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
An extremely dim, short-lived, expanding disk of reddish light found above thunderstorms and believed to be created by electromagnetic pulses from intense lightning.
Origin: e(mission of) l(ight and) v(ery low-frequency perturbations from) e(lectromagnetic pulse sources).
elve - Science Definition
An extremely dim, short-lived, expanding disk of reddish light above thunderstorms, believed to be caused by electromagnetic pulses from intense lightning in the lower ionosphere. Elves last less than a second and can be as wide as 500 km (310 mi) in diameter.