noun Etymology: French, literally, double madness Date: circa 1892 the presence of the same or similar delusional ideas in two persons closely associated with one another
FOLIE À DEUX
Meaning of FOLIE À DEUX in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012