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hallucination
(hә-loo″sĭ-na´shәn)
a sensory impression (sight, touch, sound, smell, or taste) that has no basis in external stimulation. Hallucinations can
have psychologic causes, as in mental illness, or they can result from drugs, alcohol, organic illnesses, such as brain tumor
or senility, or exhaustion. When hallucinations have a psychologic origin, they usually represent a disguised form of a repressed
conflict. adj. hallu´cinative, hallu´cinatory., adj.

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