gegenschein

noun, often capitalized
ge·gen·schein | \ˈgā-gən-ˌshīn \

Definition of gegenschein 

: a faint light about 20° across on the celestial sphere opposite the sun probably caused by backscatter of sunlight by solar-system dust

First Known Use of gegenschein

1877, in the meaning defined above

History and Etymology for gegenschein

German, from gegen against, counter- + Schein shine

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The first known use of gegenschein was in 1877

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