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The word “psychedelic” is taken from the Greek words psychē (“soul”) and dēloun (“to make visible”, “to reveal”).

The word “entheogen” was chosen to define such substances. It is derived from two words from ancient Greek: éntheos, literally “full of the god” or “possessed”; and genésthai, “to come into being”. So an entheogen is a substance that facilitates the finding of the “god within”.