Hallucination

Pronunciation

Definition 1

A sight, sound, smell, taste, or touch that a person believes to be real but is not real. Hallucinations can be caused by nervous system disease, certain drugs, or mental disorders. (NCI Dictionary)

Definition 2

A false sensory perception in the absence of an external stimulus, as distinct from an illusion which is a misperception of an external stimulus. (NCI Thesaurus)

Definition 3

A disorder characterized by a false sensory perception in the absence of an external stimulus. (NCI Thesaurus/CTCAE)

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