fo·lie à deux (fô-lē ä d, fŏlē)
n.
A condition in which symptoms of a mental disorder, such as the same delusional beliefs or ideas, occur simultaneously in two individuals who share a close relationship or association.

[TahlilGaran] American Dictionary ▲

folie a deux
[French  : folie, madness + à, between + deux, two.]

[TahlilGaran] American Dictionary ▲