Definition of Hermes Trismegistus in US English:

Hermes Trismegistus

proper noun

  • A legendary figure regarded by Neoplatonists and others as the author of certain works on astrology, magic, and alchemy.

Origin

Latin, ‘thrice-greatest Hermes’, in reference to Thoth, identified with Hermes.

Pronunciation

Hermes Trismegistus

/ˌhərmēz ˌtrisməˈjistəs/