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An arc of spectral colors, usually identified as red, orange, yellow, green, blue, indigo, and violet, that appears in the sky opposite the sun as a result of the refractive dispersion of sunlight in drops of rain or mist.
[Middle English, from Old English rēnboga : rēn, rain + boga, bow;]
(source : thefreedictionary.com)
In response to The Daily Post’s weekly photo challenge: “ROY-G-BIV”