- of or noting a mental state characterized by a profound sense of intensified sensory perception, sometimes accompanied by severe perceptual distortion and hallucinations and by extreme feelings of either euphoria or despair: LSD users seek the psychedelic properties of the drug, including heightened sensory experiences.
- of, relating to, or noting any of various drugs producing this state, such as LSD, mescaline, or psilocybin: Researchers have long been interested in the potential therapeutic effects of psychedelic drugs for humans.
- characterized by images, sounds, or feelings resembling those experienced while in the altered state produced by psychedelic drugs: Their music had a dreamy psychedelic sound, with gentle guitars and hushed vocals.The psychedelic designs of music posters in the 60s were inspired by the Art Nouveau movement of the late 1800s.
- a psychedelic drug: The clinic will start treating patients with ketamine, a psychedelic.
- a person who uses such a substance.
- relating to or denoting new or altered perceptions or sensory experiences, as through the use of hallucinogenic drugs
- denoting any of the drugs, esp LSD, that produce these effects
- (of painting, fabric design, etc) having the vivid colours and complex patterns popularly associated with the visual effects of psychedelic states
