rainbow

About 3.82 uses per million words.

Meaning

noun A multicoloured arch in the sky, produced by prismatic refraction of light within droplets of rain in the air.
noun Any prismatic refraction of light showing a spectrum of colours.
noun A wide assortment; a varied multitude.
a rainbow of possibilities
noun An illusion; a mirage.
Many electoral promises are rainbows, vanishing soon after poll day.
noun A curveball, particularly a slow one.
noun A trick in which the player makes the ball arc over the opponent's head using both feet; rainbow kick
noun In Texas hold 'em or Omaha hold 'em, a flop that contains three different suits.
noun Rainbow trout.