Hallucinogen (noun)

1. A substance that causes hallucinations, distorted perception, and changes in thought, emotion and awareness.
2. A drug that can produce hallucinations, delusions, and other profound changes in perception, thought, and feeling.

Origin:

Compound word halluci- from the latin word alucinari (to wander in mind), + -ogen, from the greek -genes (producer, generator), refers to a substance that causes hallucinations.

Examples:

1. LSD is a powerful hallucinogen.
2. Mushrooms are a natural hallucinogen.
3. Hallucinogens are drugs that can cause hallucinations and changes in perception, thought, and feeling.
4. Hallucinogens can be found in natural sources such as certain plants and mushrooms, or they can be synthetic.
5. The use of hallucinogens can lead to a range of short- and long-term effects, including hallucinations, altered thinking, and changes in mood and perception.