sunbow
noun/ˈsʌnbəʊ/
Etymology From sun + bow. Compare rainbow.
1
A bow or arc of prismatic colors like a rainbow, caused by refraction through a spray of water from a cataract, waterfall, fountain, etc., rather than through droplets of rain.
Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.