一切經音義 91.37

91.37

璽書（上斯紫反韻英云傳國寶也考聲云天子玉印古文從土作璽今從玉形聲字）。

璽書 (The upper character is pronounced with the fanqie 斯紫 [xǐ]. The Yunying says: "The imperial treasure transmitted through the state." The Kaosheng says: "The Son of Heaven's jade seal." Ancient script wrote 璽 with 土 as radical; nowadays it takes 玉 as radical; it is a phono-semantic character.)