Lichtenberg figure

noun
Lich·​ten·​berg figure | \ ˈliktənˌbərg-\

Definition of Lichtenberg figure

: a pattern of branching lines formed by fine powder (as of sulfur) dusted over an insulating surface across which an electric-leakage discharge has recently taken place

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History and Etymology for Lichtenberg figure

after Georg Christoph Lichtenberg †1799 German physicist and writer

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