續一切經音義 5.151

5.151

月厭（下於艷反韻略魅也按月厭神殺名也正月建寅月厭在戊以此逆推至十二月月厭在亥經文作靨面上黑子也非月厭字）。

Yueyan [月厭] (The second character has the fanqie phonetic spelling 於 + 艷; the Yunlve says a demon; according to references, Yueyan is the name of a baleful deity: in the first month when the dipper handle points to Yin, Yueyan is at Wu; calculating backwards in this manner up to the twelfth month, Yueyan is at Hai; the sūtra text writes 靨, which means a black mole on the face, not the character for Yueyan).