moonbownoun [ C ]
uk/ˈmuːn.bəʊ//ˈmuːn.boʊ/also lunar rainbow, /ˌluː.nə ˈreɪn.bəʊ//ˌluː.nɚ ˈreɪn.boʊ/an arch (= curved shape) of white light seen in the sky when rain is falling and the moon is shining
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rainbow
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