relating to vivid colors, patterns, and perceptions; can describe drugs that alter consciousness and perception.
From Greek 'psyche' (mind, soul) and 'delos' (manifest or reveal), literally meaning 'mind-revealing,' coined in the 1950s to describe hallucinogenic experiences.
The word was invented by scientists studying LSD in the 1950s, but it became the visual language of the 1960s—language and culture shaped each other as psychedelic posters made the word visible.
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