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nacreous cloud

noun
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Definition of nacreous cloud

: a luminous iridescent cloud that occurs at altitudes of about 85,000 feet

— called also mother-of-pearl cloud

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“Nacreous cloud.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/nacreous%20cloud. Accessed 7 Mar. 2021.

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