n., pl., -ses (-sēz).
Any of various mental or emotional disorders, such as hypochondria or neurasthenia, arising from no apparent organic lesion or change and involving symptoms such as insecurity, anxiety, depression, and irrational fears, but without psychotic symptoms such as delusions or hallucinations. No longer in scientific use.
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
