Definitions
1.nounA multicoloured arch in the sky, produced by prismatic refraction of light within droplets of rain in the air.
2.nounAny prismatic refraction of light showing a spectrum of colours.
3.noun(often used with “of”) A wide assortment; a varied multitude."a rainbow of possibilities"
4.nounAn illusion, mirage."Many electoral promises are rainbows, vanishing soon after poll day."
5.nounA curveball, particularly a slow one.
6.nounIn Texas hold 'em or Omaha hold 'em, a flop that contains three different suits.
7.nounRainbow trout.
8.verbTo brighten with, or as with, a rainbow; to pattern with the colours of the rainbow.
9.verbTo take the appearance of a rainbow.
10.adjectiveMulticolored.
11.adjectiveMade up of several races or ethnicities, or (more broadly) of several cultural or ideological factions.
12.adjectiveLGBT.
13.adjective(chiefly of a flop) Composed entirely of different suits.