cirrostratus

/ˌsɪroʊˈstreɪtəs/
noun
  1. A thin, high-altitude cloud layer that covers the sky like a sheet, often creating a halo around the sun or moon.
    • A cirrostratus cloud spread across the sky, and we could see a faint ring around the moon.
    • The sun looked hazy behind the cirrostratus, but it was still bright enough to cast shadows.
    • Meteorologists say cirrostratus often comes before a warm front and rain.
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