一切經音義 58.127

58.127

𤴨頭（古文銧𤴨二形今作疣同有留反說文𩑌顫也謂顫掉不正也顫又作戰律文作痏非體也）。

Toutou 𤴨頭 (the ancient script has two forms: 銧 and 𤴨; now written 疣; same [pronunciation]; you + liu fan [yóu]; the Shuowen says: "𩑌 means trembling"; referring to trembling, shaking, and instability. Trembling is also written 戰. The Vinaya text writes 痏, which is not the standard form).