私し書しょ函かんししょかんMeanings1nounpost office boxobsolete termObsolete term for a post office box; replaced by 私書箱 (ししょばこ) in modern Japanese.See also: 私書箱昔むかしの手て紙がみには「私し書しょ函かん第だい何なん号ごう」と書かかれていた。Old letters were addressed with 'P.O. Box No. ...' using the term 私書函.
