sunbow

noun

A rainbowlike display of colors resulting from refraction of sunlight through a spray of water.

noun

An iris formed by the refraction of light on the spray of cataracts, or on any rising vapor.

noun

A rainbow; an iris.

noun

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.