sheet lightning

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. 2012.
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Sheet lightning is always a great word to know.
So is ninnyhammer. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
a fool or simpleton; ninny.
Collins
World English Dictionary
sheet lightning
 
n
lightning that appears as a broad sheet, caused by the reflection of more distant lightning

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Science Dictionary
sheet lightning   (shēt)  Pronunciation Key 
A broad, sheetlike illumination of a portion of a thundercloud, caused by an unseen, often internal or reflected lightning flash. See also heat lightning, See more at lightning.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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