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Definitions

American Heritage® Dictionary of the English Language, Fourth Edition

  1. adj. Of, characterized by, or generating hallucinations, distortions of perception, altered states of awareness, and occasionally states resembling psychosis.
  2. n. A drug, such as LSD or mescaline, that produces such effects.

Wiktionary

  1. adj. Of, containing or generating hallucinations, distortions of perception, altered awareness etc
  2. n. Any psychoactive substance (such as LSD or psilocybin) which, when consumed, causes perceptual changes (sometimes erratic and uncontrollable), visual hallucination, and altered awareness of the body and mind.
  3. interj. awesome, cool, groovy

WordNet 3.0

  1. adj. producing distorted sensory perceptions and feelings or altered states of awareness or sometimes states resembling psychosis
  2. adj. having the vivid colors and bizarre patterns associated with psychedelic states
  3. adj. (of a mental state) characterized by intense and distorted perceptions and hallucinations and feelings of euphoria or sometimes despair

Etymologies

  1. psyche1 + Greek dēloun, to make visible (from dēlos, clear, visible; see dyeu- in Indo-European roots) + -ic.

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‘psychedelic’ has been looked up 1598 times, loved by 5 people, added to 39 lists, and has a Scrabble score of 24.