一切經音義 6.106

6.106

氤氳（上音因下威雲反易曰天地網縕萬物化淳廣雅絪絪縕縕元氣也案氤氳祥瑞氣也似雲非雲而輕盈如青煙從气音氣因昷皆聲也或從糸作絪縕昷音溫從曰從皿會意字也）。

Pervasive mist (氤氳: the first is pronounced as yīn; the second with the fanqie 威雲 [yūn]. The Classic of Changes says: "Heaven and Earth mingle their vapor, and all things transform and flourish." The Guangya says: "Yinyun means primordial vapor." I observe that yinyun is an auspicious, propitious vapor, resembling clouds yet not clouds, light and ethereal like azure smoke. It derives from vapor [气, pronounced qì], with 因 and 昷 both serving as phonetics. It is also written with silk [糸] as 絪縕. 昷 is pronounced wēn; it derives from 曰 and 皿, an associative compound).