續一切經音義 4.139

4.139

雷霆（上魯𢌞反切韻雷電也易曰天雷無妄也論衡云陰陽氣繫成聲古文作靁下特丁反考聲云疾雷也字書迅雷也）。

雷霆 (Thunder and lightning bolts: the upper character has the fanqie 魯𢌞; the Qieyun says it is thunder and lightning; the Yijing says: “Heaven's thunder, Innocence [Wuwang]”; the Lunheng says: “The yin and yang energies collide and create sound”; the ancient script writes it as 靁. The lower character has the fanqie 特丁; the Kaosheng says it is violent thunder; character dictionaries say it is sudden thunder).