/ həˈluːsɪneɪt; NAmE / verb
[ v ] to see or hear things that are not really there because of illness or drugs
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WORD ORIGIN
mid 17th cent. (in the sense be deceived, have illusions ): from Latin hallucinat- gone astray in thought, from the verb hallucinari , from Greek alussein be uneasy or distraught.