~ is added to nouns to show that someone or something is no longer the thing referred to by that noun. For example, a woman’s ~husband is no longer her husband.
...my ~wife.
...~President Reagan.
...an ~soldier.
PREFIX
EX-
Meaning of EX- in English
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012