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Hevelian halo

[huh-vey-lee-uh n]
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noun
  1. a faint white halo with an angular radius of 90° that is occasionally seen around the sun or the moon, thought to be caused by the reflection and refraction of sunlight by ice crystals.
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Origin of Hevelian halo

after J. Hevelius; see -ian
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018