from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A discharge of blue light that starts from the top of active thunderstorm clouds and proceeds upwards. Also called reverse lightning.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. atmospheric discharges (lasting 10 msec) bursting from the tops of giant storm clouds in blue cones that widen as they flash upward
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