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Hermes Tris·me·gis·tus(trĭs′mə-jĭs′təs, trĭz′-)
Hermes as identified with the Egyptian god Thoth, the legendary author of works on alchemy, astrology, and magic.
[Medieval Latin Hermēs Trismegistus, from Greek Hermēs trismegistos : Hermēs, Hermes + trismegistos, thrice greatest (tris, thrice; see trei- in Indo-European roots + megistos, greatest; see meg- in Indo-European roots).]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Classical Myth & Legend) a Greek name for the Egyptian god Thoth, credited with various works on mysticism and magic
[Greek: Hermes thrice-greatest]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
Her′mes Tris•me•gis′tus(ˌtrɪz məˈdʒɪs təs, ˌtrɪs-)
a name attributed by Neoplatonists and others to an Egyptian priest or to the Egyptian god Thoth, to some extent identified with the Greek god Hermes: various mystical, astrological, and alchemical writings were ascribed to him.
[< Medieval Latin < Greek Hermês Trismégistos Hermes thrice greatest]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.