of or noting a mental state characterized by a profound sense of intensified sensory perception, sometimes accompanied by severe perceptual distortion and hallucinations and by extreme feelings of either euphoria or despair.
of, pertaining to, or noting any of various drugs producing this state, as LSD, mescaline, or psilocybin.
resembling, characteristic of, or reproducing images, sounds, or the like, experienced while in such a state: psychedelic painting.
a psychedelic drug.
a person who uses such a substance.

1956; psyche + Greek dêl(os) visible, manifest, evident + -ic

psychedelically, adverb
prepsychedelic, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
psychedelic or psychodelic (ˌsaɪkɪˈdɛlɪk)
1.  relating to or denoting new or altered perceptions or sensory experiences, as through the use of hallucinogenic drugs
2.  denoting any of the drugs, esp LSD, that produce these effects
3.  informal (of painting, fabric design, etc) having the vivid colours and complex patterns popularly associated with the visual effects of psychedelic states
[C20: from psyche + Greek delos visible]
psychodelic or psychodelic
[C20: from psyche + Greek delos visible]
psyche'delically or psychodelic
psycho'delically or psychodelic

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1956, of drugs, suggested by H. Osmond in a letter to Aldous Huxley and used by Osmond in a scientific paper published the next year; from Gk. psykhe- "mind" (see psyche) + deloun "make visible, reveal," from delos "visible, clear." Psychedelia is from 1967.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

psychedelic psy·che·del·ic (sī'kĭ-děl'ĭk)
Of, characterized by, or generating hallucinations, distortions of perception, altered states of awareness, and occasionally states resembling psychosis. n.
A drug, such as LSD or mescaline, that produces such effects.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Cultural Dictionary
psychedelic [(seye-kuh-del-ik)]

A descriptive term for things that produce or are related to hallucinations, especially drugs such as LSD.

Note: Psychedelic art, most popular during the late 1960s and early 1970s, combines patterns, objects, light, and sound to simulate hallucinatory experiences.
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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