hallucination

hal·lu·ci·na·tion   (hə-lōō'sə-nā'shən)    n.   Perception of visual, auditory, tactile, olfactory, or gustatory experiences without an external stimulus and with a compelling sense of their reality, usually resulting from a mental disorder or as a response to a drug. The objects or events so perceived. A false or mistaken idea; a delusion. hal·lu'ci·na'tion·al, hal·lu'ci·na'tive adj.

hallucination

A false perception that appears to be real, as when, for example, a man dying of thirst in a desert thinks that he sees a lake. (See also delusion.)

Main Entry: hal·lu·ci·na·tion
Pronunciation: h&-"lüs-^&n-'A-sh&n
Function: noun
1 : aperception of something (as a visual image or a sound) with no external cause usually arising from a disorder of the nervous system (as in delirium tremens or in functional psychosis without knownneurological disease) or in response to drugs (as LSD) —compare DELUSION 2, ILLUSION 2a
2 : the object of an hallucinatory perception

hallucination hal·lu·ci·na·tion (hə-l&oomacr;'sə-nā'shən)
n.

1. False or distorted perception of objects or events with a compelling sense of their reality, usually resulting from a mental disorder or drug.

2. The objects or events so perceived.

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hal·lu'ci·nate' v.
hal·lu'ci·na'tion·al or hal·lu'ci·na'tive adj.