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A multicoloured arch in the sky, produced by prismatic refraction of light within droplets of rain in the air.
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Any prismatic refraction of light showing a spectrum of colours.
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(often used with “of”) A wide assortment; a varied multitude.
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(figurative) An illusion; a mirage.
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(baseball) A curveball, particularly a slow one.
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(soccer) A trick in which the player makes the ball arc over the opponent's head using both feet; rainbow kick
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(poker slang) In Texas hold 'em or Omaha hold 'em, a flop that contains three different suits.
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Rainbow trout.
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(figuratively, sometimes derogatory) A person within the LGBT community.