Definitions of psychedelic:

• adjective:   producing distorted sensory perceptions and feelings or altered states of awareness or sometimes states resembling psychosis

  Example: "Psychedelic drugs like psilocybin and mescaline"

• adjective:   of a mental state characterized by intense and distorted perceptions and hallucinations and feelings of euphoria or sometimes despair

  Example: "A psychedelic experience"

• adjective:   having the vivid colors and bizarre patterns associated with psychedelic states

  Example: "A psychedelic painting"