illusion

illusion definition - medical

il·lu·sion (ĭ-lo͞oˈzhən)

noun
  1. An erroneous perception of reality.
  2. An erroneous concept or belief.
  3. The condition of being deceived by a false perception or belief.
  4. Something, such as a fantastic plan or desire, that causes an erroneous belief or perception.

Related Forms:

  • il·luˈsion·al, il·luˈsion·arˌy (-zhə-nĕrˌē) 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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