Definition of Hermes Trismegistus

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Hermes Tris·me·gis·tus    (trsm-jsts, trz-) KEY 

NOUN:
Mythology

Hermes as identified with the Egyptian god Thoth, the legendary author of works on alchemy, astrology, and magic.

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ETYMOLOGY:
Medieval Latin Herms Trismegistus, from Greek Herms trismegistos : Herms, Hermes + trismegistos, thrice greatest ( tris, thrice; see trei- in Indo-European roots + megistos, greatest; see meg- in Indo-European roots)