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n. pl. ant·he·li·a (-lē-ə) or ant·he·li·ons
A luminous, white, diffuse spot occasionally seen in the sky opposite the sun on the parhelic circle.
n, pl -lia (-lɪə)
1. (Physical Geography) 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. (Physical Geography) 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]
A luminous area like a halo sometimes seen in the sky opposite the sun.