A rare atmospheric phenomenon similar to a rainbow, created by light refracting through ice crystals in fog or frost rather than water droplets in rain.
A compound of 'frost' and 'bow' (as in rainbow). This technical meteorological term describes an optical effect where frozen particles create spectral colors, analogous to how rainbows work.
Frostbows are real but incredibly rare—you need the exact conditions of ice crystals plus sunshine at the right angle, which is why most people never see one, even though they're just as scientifically cool as rainbows.
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