psychedelic:1

noun
psy*che*del*ic \ ˌsī-kə-ˈde-lik \
1956
  • a psychedelic drug (such as LSD)

psychedelic:2

adjective
psychedelic \
1957{ds||1|a|}
  • of, relating to, or being drugs (such as LSD) capable of producing abnormal psychic effects (such as hallucinations) and sometimes psychotic states
  • produced by or associated with the use of psychedelic drugs
  • imitating, suggestive of, or reproducing effects (such as distorted or bizarre images or sounds) resembling those produced by psychedelic drugs

prepsychedelic

adjective
pre*psy*che*del*ic \ ˌprē-ˌsī-kə-ˈde-lik \
1967
  • of, relating to, characteristic of, or being a time before the psychedelic period of the mid- to late-1960s
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