Is RAINBOW a valid Scrabble word?

Yes. RAINBOW is valid in Collins Scrabble Words 2024, the word list used for Scrabble in the UK.

What RAINBOW means

• noun - A multicoloured arch in the sky, produced by prismatic refraction of light within droplets of rain in the air.
• adjective - Multicolored, especially if in rainbow order.
• verb - To brighten with, or as with, a rainbow; to pattern with the colours of the rainbow.

Definitions come from Wiktionary via kaikki.org, shortened to fit, and are used under CC BY-SA 4.0.

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