nacreous cloud

/ˌneɪkriəs klaʊd/
IPA guide

Definitions of nacreous cloud
  1. noun
    a luminous iridescent cloud at a high altitude that may be seen when the sun is a few degrees below the horizon
    synonyms: mother-of-pearl cloud
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    type of:
    cloud
    a visible mass of water or ice particles suspended at a considerable altitude
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