續一切經音義 7.54

7.54

門閫（下苦本反聲類云閫閾也集注云謂限門木也顧野王云門限也說文云門限也從門困聲）。

門閫 (The lower character is 苦 + 本 [kǔn]; the Shenglei says: "Kǔn means the threshold"; the Jizhu says: "Meaning the wood defining the doorway"; Gu Yewang says: "The door threshold"; the Shuowen says: "A door threshold; formed from 門 (gate) with 困 as phonetic").