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lightning
(redirected from Megalightning)

   Also found in: Medical, Encyclopedia, Wikipedia 0.01 sec.
light·ning  (ltnng)
n.
1.
a. An abrupt, discontinuous natural electric discharge in the atmosphere.
b. The visible flash of light accompanying such a discharge.
2. Informal A sudden, usually improbable stroke of fortune.
intr.v. light·ninged (-nngd), light·ning, light·nings
To discharge a flash of lightning.
adj.
Moving or occurring with remarkable speed or suddenness.

[Middle English, gerund of lightnen, to illuminate, from lighten, from Old English lhtan; see leuk- in Indo-European roots.]

lightning [ˈlaɪtnɪŋ]
n
1. (Earth Sciences / Physical Geography) a flash of light in the sky, occurring during a thunderstorm and caused by a discharge of electricity, either between clouds or between a cloud and the earth Related adjs fulgurous, fulminous
2. (modifier) fast and sudden a lightning raid
[variant of lightening]

lightning  (ltnng)
A flash of light in the sky caused by an electrical discharge between clouds or between a cloud and the Earth's surface. The flash heats the air and usually causes thunder. Lightning may appear as a jagged streak, as a bright sheet, or in rare cases, as a glowing red ball.
A Closer Look As storm clouds develop, the temperature at the top of the cloud becomes much cooler than that at the bottom. For reasons that scientists still do not understand, this temperature difference results in the accumulation of negatively charged particles near the base and positively charged particles near the top of the storm cloud. The negatively charged particles repel the electrons of atoms in nearby objects, such as the bases of other storm clouds or tall objects on the ground. Consequently, these nearby objects take on a positive charge. The difference in charge, or voltage, builds until an electric current starts to flow between the objects along a pathway of charged atoms in the air. The current flow heats up the air to such a degree that it glows, generating lightning. Initially, a bolt of lightning carrying a negative charge darts from one storm cloud to another or from a storm cloud to the ground, leaving the bottom of the cloud with a positive charge. In response, a second bolt (reverse lightning) shoots in the opposite direction (from the other storm cloud or the ground) as the mass of negative charges on it moves back to neutralize the positive charge on the bottom of the first cloud. The heat generated by the lightning causes the air to expand, in turn creating very large sound waves, or thunder.
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lightning

Lightning
an abnormal fear of lightning.
the recording of occurrences of lightning and thunder on a time scale attached to a revolving drum. — keraunograph, n. — keraunographic, adj.
an abnormal fear of thunder and lightning.
a form of divination involving thunder and lightning.

lightning


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