Sheet-lightning
noun
1.
lightning appearing merely as a general illumination over a broad area, usually because the path of the flash is obscured by clouds.
sheet lightning
noun
1.
lightning that appears as a broad sheet, caused by the reflection of more distant lightning
sheet lightning
(shēt)
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.
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