moonbow
/ˈmunˌboʊ/
noun
- A rainbow caused by the light of the moon, usually appearing as a white or faintly colored arc in the night sky.
- The photographer captured a stunning moonbow arching across the dark sky.
- We stayed up late hoping to see a moonbow over the waterfall.
- Moonbows are much rarer than rainbows because they need a bright moon and misty air.