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anthelion

[ant-hee-lee-uh n, an-thee-]
noun, plural ant·he·li·a [ant-hee-lee-uh, an-thee-] /æntˈhi li ə, ænˈθi-/.
  1. a luminous, white spot occasionally appearing at the sun's elevation but in the opposite part of the sky.
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Origin of anthelion

1660–70; < Late Greek anthḗlion, neuter of anthḗlios opposite the sun, equivalent to ant- ant- + hḗli(os) the sun + -os adj. suffix
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for anthelion

anthelion

noun plural -lia (-lɪə)
  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
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Word Origin

C17: from Late Greek, from anthēlios opposite the sun, from ante- + hēlios sun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

anthelion in Science

anthelion

[ănt-hēlē-ən, ăn-thē-]
Plural anthelia
  1. 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.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.