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heat lightning

noun

Simple Definition of heat lightning

  • : flashes of light in the sky that happen without the sound of thunder and that are produced by distant lightning

Source: Merriam-Webster's Learner's Dictionary

Full Definition of heat lightning

  1. :  vivid and extensive flashes of electric light without thunder seen near the horizon especially at the close of a hot day and ascribed to far-off lightning reflected by high clouds

1810

First Known Use of heat lightning

1810


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