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Heat lightning

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heat lightning

–noun
lightning too distant for thunder to be heard, observed as diffuse flashes near the horizon on summer evenings.

Origin:
1825–35, Americanism
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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heat lightning  
n.  Intermittent flashes of light near the horizon, usually seen on a hot summer evening, unaccompanied by thunder and thought to be cloud reflections of distant lightning.
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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