sundog

[suhn-dawg, -dog]
noun
2.
a small or incomplete rainbow.

Origin:
1625–35; origin uncertain

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World English Dictionary
sundog (ˈsʌnˌdɒɡ)
 
n
1.  another word for parhelion
2.  a small rainbow or halo near the horizon

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

sundog
"mock sun, parhelion," 1653, of obscure origin.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The moist, coastal air has moved in and the sun is constantly ringed with a sundog.
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