psy·che·del·ic Pronunciation (sk-dlk)
adj. 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.
[psyche1 + Greek dloun, to make visible (from dlos, clear, visible; see dyeu- in Indo-European roots) + -ic.] psyche·deli·cal·ly adv.