Definition of heat lightning
: 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
First Known Use of heat lightning
HEAT LIGHTNING Defined for English Language Learners
Definition of heat lightning for English Language Learners
: flashes of light in the sky that happen without the sound of thunder and that are produced by distant lightning
Seen and Heard
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