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folie á deux in Medicine

folie á deux

(fô-lē′ ä dœ, fŏl′ē)
n.
  1. 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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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.