folie a deux

1. 1.

   the simultaneous occurrence of symptoms of a mental disorder (as delusions) in two persons who are closely related (as siblings or man and wife)

   Broadermental disorder

Questions about folie a deux

What does folie a deux mean?

folie a deux means "the simultaneous occurrence of symptoms of a mental disorder (as delusions) in two persons who are closely related (as siblings or man and wife)".

Is folie a deux a common word?

folie a deux is banded "Rare" — specialist or archaic — most readers will not have met it. The band comes from how often the word appears in a large corpus of everyday English, not from an editor's impression.