<p><strong>Adjective:</strong></p><ul><li>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.</li><li>of, relating to, or noting any of various drugs producing this state, such as LSD, mescaline, or psilocybin.</li><li>characterized by images, sounds, or feelings resembling those experienced while in the altered state produced by psychedelic drugs.</li></ul><p><strong>Noun:</strong></p><ul><li>a psychedelic drug: The clinic will start treating patients with ketamine, a psychedelic.</li><li>Rare: a person who uses such a substance.</li></ul><p><strong>End of Response</strong></p>