1. A luminous halo parallel to the horizon at the altitude of the sun; caused by ice crystals in the atmosphere
   - solar halo, parhelic circle

Derived forms: parhelic rings

Type of: halo

• Sir William Gerald Golding
• Sir William Gilbert
• Sir William Herschel
• Sir William Huggins
• Sir William Rowan Hamilton
• immoveable
• immune
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• immune suppressant drug
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