from The American Heritage® Dictionary of the English Language, 4th Edition

  • 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.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A rare syndrome in which a symptom of psychosis (particularly a paranoid or delusional belief) is transmitted from one person to another.


French : folie, madness + à, between + deux, two.
(American Heritage® Dictionary of the English Language, Fourth Edition)
French folie à deux, "madness of two (people)". (Wiktionary)


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  • A shared psychosis or delusion, especially one passed from one to another.

    May 16, 2008