Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. 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.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A mental disorder, less severe than psychosis, marked by anxiety or fear

from the GNU version of the Collaborative International Dictionary of English

  • n. A functional nervous affection or disease, that is, a disease of the nerves without any appreciable change of nerve structure.
  • n. a mental or emotional disorder that affects only part of the personality, and involves less distorted perceptions of reality than a psychosis. As used in medicine, anxiety is a prominent characteristic, and the condition may be accompanied by psychosomatic symptoms. Phobias and compulsive behavior are common varieties.

from The Century Dictionary and Cyclopedia

  • n. A nervous disease without recognizable anatomical lesion, as epilepsy, hysteria, neuralgia, etc.
  • n. In neurology, a process of nervous excitation: used thus generally only in opposition to psychosis, a mental process.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a mental or personality disturbance not attributable to any known neurological or organic dysfunction

Etymologies

neuro- + -osis (Wiktionary)

Examples

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