• Definition for "nacreous cloud"
    • A cloud resembling a cirrus, showing iridescent color…
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  • Hypernym for "nacreous cloud"

nacreous cloud definition

  • noun:
    • A cloud resembling a cirrus, showing iridescent color once the sun is several degrees underneath the horizon.
    • polar stratospheric cloud
    • a luminous iridescent cloud at a top altitude that could be seen if the sunlight is some degrees underneath the horizon
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