sun bow

sunbow

[suhn-boh]
noun
a bow or arc of prismatic colors like a rainbow, appearing in the spray of cataracts, waterfalls, fountains, etc.

Origin:
1810–20; sun + bow2

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Collins
World English Dictionary
sunbow (ˈsʌnˌbəʊ)
 
n
a bow of prismatic colours similar to a rainbow, produced when sunlight shines through spray

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
sunbow   (sŭn'bō')  Pronunciation Key 
A prismatic arc of colors, similar to a rainbow, resulting from the refraction of sunlight through a mist or spray of water.
The American Heritage® Science Dictionary
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