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Bishop's ring

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noun Meteorology.
  1. a reddish-brown corona occasionally seen around the sun, caused by volcanic dust in the atmosphere.
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Origin of Bishop's ring

after Sereno E. Bishop (1827–1909), U.S. missionary in Hawaii, who described such rings, resulting from the explosion of Krakatoa, in 1883
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018