folie à deux

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

Definition of folie à deux

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

Origin and Etymology of folie à deux

French, literally, double madness

First Known Use: circa 1892

Learn More about folie à deux

Seen and Heard

What made you want to look up folie à deux? Please tell us where you read or heard it (including the quote, if possible).