delusion

delusion definition - medical

de·lu·sion (dĭ-lo͞oˈzhən)

noun
A false belief strongly held in spite of invalidating evidence, especially as a symptom of mental illness.

Related Forms:

  • de·luˈsion·al adjective

The American Heritage® Medical Dictionary Copyright © 2009 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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