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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.
(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.