anthelion

[ant-hee-lee-uhn, an-thee-]
noun, plural anthelia [ant-hee-lee-uh, an-thee-] .
a luminous, white spot occasionally appearing at the sun's elevation but in the opposite part of the sky.

Origin:
1660–70; < Late Greek anthḗlion, neuter of anthḗlios opposite the sun, equivalent to ant- ant- + hḗli(os) the sun + -os adj. suffix

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Collins
World English Dictionary
anthelion (æntˈhiːlɪən, ænˈθiː-)
 
n , pl -lia
1.  a faint halo sometimes seen in polar or high altitude regions around the shadow of an object cast onto a thick cloud bank or fog
2.  a white spot occasionally appearing on the parhelic circle at the same height as and opposite to the sun
 
[C17: from Late Greek, from anthēlios opposite the sun, from ante- + hēlios sun]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
anthelion   (ānt-hē'lē-ən, ān-thē'-)  Pronunciation Key 
Plural anthelia
A bright white or colored spot appearing at times in the sky opposite the Sun. White anthelia are believed to form from light that is reflected off atmospheric ice crystals; colored anthelia are believed to form from light that is refracted by atmospheric ice crystals. Compare parhelion.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Also absent was any form of anthelion on the parhelic circle itself.
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