Definitions for: Lightning

[n] the flash of light that accompanies an electric discharge in the atmosphere (or something resembling such a flash); can scintillate for a second or more
[n] abrupt electric discharge from cloud to cloud or from cloud to earth accompanied by the emission of light

Webster (1913) Definition: Light"ning (l[imac]t"n[i^]ng), n. [For lightening,
fr. lighten to flash.]
1. A discharge of atmospheric electricity, accompanied by a
vivid flash of light, commonly from one cloud to another,
sometimes from a cloud to the earth. The sound produced by
the electricity in passing rapidly through the atmosphere
constitutes thunder.

2. The act of making bright, or the state of being made
bright; enlightenment; brightening, as of the mental
powers. [R.]

Ball lightning, a rare form of lightning sometimes seen as
a globe of fire moving from the clouds to the earth.

Chain lightning, lightning in angular, zigzag, or forked

Heat lightning, more or less vivid and extensive flashes of
electric light, without thunder, seen near the horizon,
esp. at the close of a hot day.

Lightning arrester (Telegraphy), a device, at the place
where a wire enters a building, for preventing injury by
lightning to an operator or instrument. It consists of a
short circuit to the ground interrupted by a thin
nonconductor over which lightning jumps. Called also
lightning discharger.

Lightning bug (Zo["o]l.), a luminous beetle. See Firefly.

Lightning conductor, a lightning rod.

Lightning glance, a quick, penetrating glance of a
brilliant eye.

Lightning rod, a metallic rod set up on a building, or on
the mast of a vessel, and connected with the earth or
water below, for the purpose of protecting the building or
vessel from lightning.

Sheet lightning, a diffused glow of electric light flashing
out from the clouds, and illumining their outlines. The
appearance is sometimes due to the reflection of light
from distant flashes of lightning by the nearer clouds.

Light"ning (l[imac]t"n[i^]ng), vb. n.
Lightening. [R.]

See Also: atmospheric electricity, bolt, bolt of lightning, chain lightning, flash, forked lightning, heat lightning, sheet lighting, thunderbolt

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