Definition of psychedelic adjective from the Oxford Advanced Learner's Dictionary



    BrE BrE//ˌsaɪkəˈdelɪk//
    ; NAmE NAmE//ˌsaɪkəˈdelɪk//
    [usually before noun]
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  1. 1(of drugs) causing the user to see and hear things that are not there or that do not exist (= to hallucinate)
  2. 2(of art, music, clothes, etc.) having bright colours, strange sounds, etc. like those that are experienced when taking psychedelic drugs
  3. Word Origin1950s: formed irregularly from psyche + Greek dēlos ‘clear, manifest’ + -ic.
See the Oxford Advanced American Dictionary entry: psychedelic