noun \hə-ˈlü-sə-nə-jən\

: a substance (such as a drug) that causes people to see or sense things that are not real : a substance that causes hallucinations

Full Definition of HALLUCINOGEN

:  a substance that induces hallucinations
hal·lu·ci·no·gen·ic \-ˌlü-sə-nə-ˈje-nik\ adjective or noun


hallucination + -o- + -gen
First Known Use: 1954


noun \hə-ˈlüs-ən-ə-jən\   (Medical Dictionary)

Medical Definition of HALLUCINOGEN

: a substance and especially a drug that induces hallucinations


noun    (Concise Encyclopedia)

Substance that produces psychological effects normally associated only with dreams, schizophrenia, or religious visions. It produces changes in perception (ranging from distortions in what is sensed to perceptions of objects where there are none), thought, and feeling. Those that have aroused the most controversy include Ecstasy, LSD, mescaline, psilocybin (from certain mushrooms), and bufotenine (from the skin of toads); some would add marijuana. The mode of action is still not clear; serotonin, epinephrine, or other neurotransmitters may be affected.


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