Frost"bow` (?), n. A white arc or circle in the sky attending frosty weather and formed by reflection of sunlight from ice crystals floating in the air; the parhelic circle whose center is at the zenith.

Frost"bow` (?), n. A white arc or circle in the sky attending frosty weather and formed by reflection of sunlight from ice crystals floating in the air; the parhelic circle whose center is at the zenith.