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Sheet lightning

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sheet lightning

–noun
lightning appearing merely as a general illumination over a broad area, usually because the path of the flash is obscured by clouds.

Origin:
1820–30
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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sheet lightning  
n.  Lightning that appears as a broad sheetlike illumination of parts of a thundercloud, caused by the reflection of a lightning flash.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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