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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”.

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