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Definition of Folie a deux
1. Noun. The simultaneous occurrence of symptoms of a mental disorder (as delusions) in two persons who are closely related (as siblings or man and wife).
Medical Definition of Folie a deux
1. Identical or similar mental disorders, such as a paranoid fixation, usually affecting two members of the same family living together. Synonym: shared psychotic disorder. Origin: Fr. Two (05 Mar 2000)