parheliacal-ring

parhelic circle

noun Meteorology.
a white, horizontal band passing through the sun, either incomplete or extending around the horizon, produced by the reflection of the sun's rays from the vertical faces of ice prisms in the atmosphere.
Also called parheliacal ring.


Origin:
1885–90; parhel(ion) + -ic

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World English Dictionary
parhelic circle
 
n
meteorol a luminous band at the same altitude as the sun, parallel to the horizon, caused by reflection of the sun's rays by ice crystals in the atmosphere

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
parhelic circle   (pär-hē'lĭk)  Pronunciation Key 
A luminous halo visible at the height of the Sun and parallel to the horizon, caused by the Sun's rays reflecting off atmospheric ice crystals.
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