folie à deux

noun fo·lie à deux \fȯ-lē-ä-ˈdœ, ˌfä-lē-ˌä-ˈdə(r)\

Definition of FOLIE À DEUX

: the presence of the same or similar delusional ideas in two persons closely associated with one another

French, literally, double madness

First Known Use: circa 1892

Medical Dictionary

noun \-(ˌ)ä-ˈdœ̅, -ˈdə\

plural folies à deux \ˌfō-ˈlē(z)-(ˌ)ä-\

: the presence of the same or similar delusional ideas in two persons closely associated with one another

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