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English definition of “rainbow”

rainbow

noun [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 tropical butterfly's wings were shimmering with all the colours of the rainbow.
(Definition of rainbow from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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