folie a deux

folie à deux

[fo-lee uh doo; French faw-lee a dœ]
noun, plural folies à deux [fo-leez uh doo; French faw-lee za dœ] . Psychiatry.
the sharing of delusional ideas by two people who are closely associated.

Origin:
1890–95; < French

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World English Dictionary
folie à deux (ˈfɒlɪ æ ˈdɜː)
 
n
psychiatry mental illness occurring simultaneously in two intimately related persons who share some of the elements of the illness, such as delusions
 
[French: madness involving two (people)]

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American Heritage
Medical Dictionary

folie á deux fo·lie á deux (fô-lē' ä dɶ', fŏl'ē)
n.
A condition in which symptoms of a mental disorder, occur simultaneously in two individuals who share a close relationship or association.

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