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Meaning of thought disorder

thought' disor"der

Pronunciation: [key]
— Psychiatry. Psychiatry.
  1. disorganized speech, as flight of ideas or loosening of associations, thought to reflect disorganized thinking and occurring as a symptom of some types of mental illness, as manic disorder or schizophrenia.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.