WordReference Random House Unabridged Dictionary of American English © 2017
sheet light′ning, 
  • Meteorologylightning appearing merely as a general illumination over a broad area, usually because the path of the flash is obscured by clouds.
    • 1820–30


    Collins Concise English Dictionary © HarperCollins Publishers::

    sheet lightning n
    1. lightning that appears as a broad sheet, caused by the reflection of more distant lightning



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