rainbownoun [ C ]
uk/ˈreɪn.bəʊ/us/-boʊ/B2 an arch (= curved shape) of different colours seen in the sky when rain is falling and the sun is shining:
The sun came out and we saw a rainbow.
The tropical butterfly's wings were shimmering with all the colours of the rainbow.
More examples
- Look over there - there's a rainbow!
- The glass prism refracted the white light into the colours of the rainbow.
- The colours of the spectrum - red, orange, yellow, green, blue, indigo and violet - can be seen in a rainbow.
- She did a stencil of a rainbow on her daughter's bedroom wall.
- There's a double rainbow!
Thesaurus: synonyms and related words
Precipitation: rain
- acid rain
- bucket
- bucket down
- cloudburst
- drizzle
- heaven
- it's raining cats and dogs! idiom
- puddle
- rain gauge
- raindrop
- rainstorm
- rainwater
- Scotch mist
- sheet
- shower
- sprinkle
- teem
- wash
- washout
- wet
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