1. relating to or denoting drugs that produce hallucinations and apparent expansion of consciousness
2. having intense, vivid colors or a swirling abstract pattern

1. a psychedelic drug

Examples

• The 1960s counterculture movement was associated with psychedelic drugs.
• She wore a psychedelic shirt with swirling patterns in bright colors.
• The artist created psychedelic posters for rock concerts.
• LSD is considered a powerful psychedelic.
• The room was decorated with psychedelic artwork from the hippie era.
• Researchers are studying psychedelics for potential medical uses.
• The light show created a psychedelic atmosphere at the concert.