from The American Heritage® Dictionary of the English Language, 4th Edition
- n. 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. Also called parhelic ring.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A luminous halo, each side of the sun parallel to the horizon, caused by refraction of sunlight through ice crystals.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a luminous halo parallel to the horizon at the altitude of the sun; caused by ice crystals in the atmosphere
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