The word Psychedelic was coined in 1957 by Canadian born British psychiatrist Dr. Humphry Osmond. He combined the Greek words “psyche” meaning "mind or spirit" and “delos” meaning "manifesting." 

 

The dictionary definition of the verb manifest is "to become clear or apparent" which is congruent with many reports of deep personal insight and creative epiphany gained through the use of psychedelic substances like Psilocybin, LSD, Mescaline, Di-Methyl-Tryptamine, and more.