一切經音義 6.50

6.50

幽冥（幼摎反鄭注禮記云幽暗也說文隱也從山𢆶聲𢆶音同上冥字前已釋樛音經由反）。

Deep dark (幽冥: the first is pronounced with the fanqie 幼摎 [yōu]. Zheng's commentary on the Book of Rites says: "You means dark and obscured." The Shuowen says: "Concealed." It derives from mountain [山] with 𢆶 as phonetic; 𢆶 is pronounced the same. The character 冥 has already been explained previously. 樛 is pronounced with the fanqie 經由 [jiū]).