Psychedelic Definition

sīkĭ-dĕlĭk
adjective
Of or causing extreme changes in the conscious mind, as hallucinations, delusions, intensification of awareness and sensory perception, etc.
Webster's New World
Of or associated with psychedelic drugs; specif., simulating the auditory or visual effects of the psychedelic state.
Webster's New World
Designating any of various fluorescent colors popularized during the 1960s.
Webster's New World
Antonyms:
noun
A psychedelic drug.
Webster's New World

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.

Wiktionary
Synonyms:
interjection

(hippie slang) Awesome, cool, groovy.

Wiktionary

Other Word Forms of Psychedelic

Noun

Singular:
psychedelic
Plural:
psychedelics

Origin of Psychedelic

  • psyche Greek dēloun to make visible (from dēlos clear, visible dyeu- in Indo-European roots) –ic

    From American Heritage Dictionary of the English Language, 5th Edition

  • From Ancient Greek ψυχή (psychÄ“, “mind, soul") + δῆλος (dÄ“los, “manifest, visible") + English -ic

    From Wiktionary

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