Hallucinate (verb)

To have a hallucination; to experience a false perception of something that is not actually present.

Origin:

Late latin hallucinat- "wandered in mind", from the verb hallucinare, from latin alucinari "wander in mind", from alucinari, from alucin- "wanderer", from aluce "wander, stray".

Examples:

1. He hallucinated that there were giant spiders crawling on the wall.
2. She had been hallucinating for days before anyone realized she was ill.
3. He hallucinated that he was in a different place and time.
4. The patient was hallucinating and could not distinguish between reality and fantasy.
5. The drug causes hallucinations that can be very vivid and realistic.