What does psychedelic mean?
Psychedelic describes experiences, substances, artworks, or styles associated with profound changes in perception and consciousness. The term is most commonly used for the vivid imagery, altered sensations, and unusual thought patterns produced by drugs such as psilocybin, LSD, and mescaline, though it also became an important label for the experimental music and visual art of the 1960s. In contemporary usage, psychedelic can refer more broadly to anything surreal, dreamlike, or radically imaginative, including designs and music that have no direct connection to drugs. In this broader sense, the word often carries associations with experimentation, freedom, creativity, and countercultural identity. As a noun, it is less common and can refer either to a psychoactive substance associated with altered perception or, occasionally, to the experience itself. The word derives from Greek roots meaning “mind” and “manifest,” reflecting the historical idea that such substances make the mind visible or expressive.
Relating to or causing altered states of perception, consciousness, or thought, especially those associated with hallucinogenic drugs; characterized by surreal or vivid imagery.
"The exhibition brought together examples of psychedelic art and music from the counterculture era."
The adjective has both a drug-related sense and a broader artistic or cultural sense.
A psychedelic drug or, less commonly, an experience involving altered perception and consciousness.
"Researchers studied the drug as a potential psychedelic treatment for depression."
This noun use is relatively uncommon compared with the adjective, and it can refer to either a substance or an experience.
Usually used to refer to psychedelic drugs, especially in technical or informal discussion.
"The study compared the effects of several psychedelics on participants’ perception."
The word psychedelic literally means “mind-manifesting,” a fitting description for experiences in which the mind reshapes perception itself.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does psychedelic come from?
The word was formed in the early 20th century from Greek psykhē, meaning “mind” or “soul,” and dēlos, meaning “manifest” or “visible.” It was initially used in medical discussions of mental illness and later became associated with experimental drugs and the counterculture of the 1960s. Its roots are related to those in psyche, psychology, psychiatry, and psychic.
Related word forms
How psychedelic is actually used
Psychedelic is widely used in both formal and informal contexts. In cultural and artistic discussion, it can describe music, design, literature, and visual art characterized by surreal or mind-altering imagery. The informal sense “unconventional or wildly imaginative” is common but less precise than the medical and cultural senses.
Easily confused with psychedelic
Psychedelic describes a broad range of effects or experiences, while hallucinogenic more specifically refers to substances that cause hallucinations.
Psychotropic means affecting the mind or emotions and can include both hallucinogenic and non-hallucinogenic substances, whereas psychedelic is more closely associated with vivid perceptual changes.