RAINBOWS

A multicoloured arch in the sky, produced by prismatic refraction of light within droplets of rain in the air.

Any prismatic refraction of light showing a spectrum of colours.

(often used with “of”) A wide assortment; a varied multitude.

"a rainbow of possibilities"

To brighten with, or as with, a rainbow; to pattern with the colours of the rainbow.

To take the appearance of a rainbow.