hallucina-, hallucino-, hallucinat-

1. A mental perception of something that does not really exist: A hallucination is often a delusion or result of a disorder of the nervous system, acute alcoholism, the taking of certain drugs, etc.
2. A wandering of the mind or an error, a mistake, or a blunder: The summary of what Greg owed the government for his income tax was considered an obvious hallucination by the man who prepared the report. © ALL rights are reserved.

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False sensations of body movements, as with an amputated-phantom limb: Fred was sure that he was feeling his amputated right arm moving very often, however Dr. Fisher explained that he was actually experiencing kinesthetic hallucinations.