An
arch of colours visible in the sky, caused by the refraction and
dispersion of the sun’s light by rain or other water droplets in the
atmosphere.
The colours of the rainbow are generally said to be red,
orange, yellow, green, blue, indigo, and violet: all the colours of the rainbowa display of the colours of the spectrum produced by dispersion of light.
A wide range of related and typically colourful things:a rainbow of medals decorated his chest.
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