1. Of, characterized by, or generating hallucinations, distortions of perception, altered states of awareness, and occasionally states resembling psychosis.
2. Suggestive or evocative of an altered or hallucinatory state of perception: psychedelic patterns; psychedelic music.
A drug, such as LSD or mescaline, that produces psychedelic effects.
[PSYCHE1 + Greek dēloun, to make visible (from dēlos, clear, visible; see dyeu- in the Appendix of Indo-European roots) + -IC.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2019 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.