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(meteorology) A rainbow formed by moonlight diffracted by water droplets in the air, usually fainter than a daytime rainbow and with fewer distinguishable colours.
1896, James Wells, Travel-pictures from Palestine, page 94:
Often rainbows by night or moonbows span the lake.
2010, Bernd Brunner, Moon: A Brief History, unnumbered page:
Among the rarer optical effects associated with the moon are also moonbows or lunar rainbows.
2011, Colleen Ryckert Cook, Kentucky: Past and Present, page 9:
When the sun shines over Kentucky's Cumberland Falls, the mist creates a rainbow on most days. If the moon shines brightly enough, it can create a moonbow, too!