Hevelian halo

American

[huh-vay-lee-uhn] / həˈveɪ li ən /

noun

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.

After J. Hevelius; see -ian

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Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023