From Longman Dictionary of Contemporary Englishhallucinatehal‧lu‧ci‧nate /həˈluːsəneɪt/ verb [intransitive] MPIMAGINEto see or hear things that are not really there► see thesaurus at imagine→ See Verb table
Examples from the Corpus
hallucinate• After two days without food and water, Voss began to hallucinate.• Miguel walked through it as if hallucinating.• Thought processes become distorted and you hallucinate.• While in his medicated, pain-saturated state, he begins to hallucinate.• She wasn't hallucinating any more, she knew.• After hallucinating from oxygen deprivation in the Himalayas, Haver vowed to ski the Seven Summits.• Sylvia had started to hallucinate, seeing creepy-crawlies on her bed, and the houseman had to come and sort her out.Origin hallucinate (1800-1900) Latin past participle of hallucinari “to dream” 