Meaning of “rainbow” in the English Dictionary

american-english dictionary

"rainbow" in British English

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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.

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(Definition of “rainbow” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"rainbow" in American English

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rainbownoun [ C ]

us /ˈreɪnˌboʊ/

an arch of many colors sometimes seen in the sky for a short time when it rains and the sun is shining

(Definition of “rainbow” from the Cambridge Academic Content Dictionary © Cambridge University Press)