Hermes Trismegistus

noun Hermes Tris·me·gis·tus \-ˌtris-mə-ˈjis-təs\

Definition of HERMES TRISMEGISTUS

: a legendary author of works embodying magical, astrological, and alchemical doctrines

Medieval Latin, from Greek Hermēs trismegistos, literally, Hermes thrice greatest

First Known Use: 1583

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