Sheet-lightning definitions

Lightning that appears as a broad sheetlike illumination of parts of a thundercloud, caused by the reflection of a lightning flash.
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A sheetlike flash of light in the sky, caused by lightning reflected and diffused by thunderclouds.
noun
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A broad, sheetlike illumination of a portion of a thundercloud, caused by an unseen, often internal or reflected lightning flash.
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A broad flash of lightning, with no visible bolt, due to reflection.
noun
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