a name variously ascribed by Neoplatonists and others to an Egyptian priest or to the Egyptian god Thoth, to some extent identified with the Grecian Hermes: various mystical, religious, philosophical, astrological, and alchemical writings were ascribed to him.
Origin of Hermes Trismegistus
< Medieval Latin < Greek Hermês Trismégistos Hermes thrice greatest
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
a Greek name for the Egyptian god Thoth, credited with various works on mysticism and magic
Word Origin for Hermes Trismegistus
Greek: Hermes thrice-greatest
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012