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light•ning

Pronunciation: (līt'ning), [key]
—n., v., -ninged, -ning,
—adj.

—n.
a brilliant electric spark discharge in the atmosphere, occurring within a thundercloud, between clouds, or between a cloud and the ground.

—v.i.
to emit a flash or flashes of lightning (often used impersonally with it as subject): If it starts to lightning, we'd better go inside.

—adj.
of, pertaining to, or resembling lightning, esp. in regard to speed of movement: lightning flashes; lightning speed.

lightness

lightning arrester

See also:

lightning (Thesaurus)
lightning (Encyclopedia)

Dictionary

light•ning

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