巻けん層そう雲うん

noun

cirrostratus

A high-altitude, thin, whitish cloud layer that often produces halo phenomena. Technical meteorological term.

• 巻けん層そう雲うんが空そら全ぜん体たいに広ひろがると、太たい陽ようの周まわりに暈かさが見みえることがある。

  When cirrostratus spreads across the sky, a halo can sometimes be seen around the sun.