1. a psychoactive substance used in a religious, shamanic, or spiritual context. Historically, entheogens were mostly derived from plant sources and have been used in a variety of traditional religious contexts.
2. any substance, such as a plant or drug, taken to bring on a spiritual experience.
Etymology: “generating the divine within” - neologism coined in 1979 by a group of ethnobotanists and scholars of mythology. The term is derived from two words of ancient Greek, ἔνθεος (entheos) and γενέσθαι (genesthai). The adjective entheos translates to English as “full of the god, inspired, possessed”. The Greeks used it as a term of praise for poets and other artists. Genesthai means “to come into being”.