續一切經音義 8.53

8.53

門閫（上莫毘反爾雅云正門謂之應門顧野王云在堂房曰戶城郭曰門說文云從二戶作門下苦本反說文云門限也從門困聲也）。

Threshold of a gate (門閫: the first character is [pronounced] 莫毘 [mén]; the Erya says: "The main gate is called the yingmen." Gu Yewang says: "In halls and rooms it is called a door (戶); in inner and outer city walls it is called a gate (門)." The Shuowen says: "It is composed of two doors (戶) to form 門." The second character is [pronounced] 苦本 [kǔn]; the Shuowen says: "A door threshold. It is composed of 門 with 困 phonetic").