[ hur-met-ik ]
/ hɜrˈmɛt ɪk /


made airtight by fusion or sealing.
not affected by outward influence or power; isolated.
(sometimes initial capital letter) of, relating to, or characteristic of occult science, especially alchemy.
(initial capital letter) of or relating to Hermes Trismegistus or the writings ascribed to him.

Nearby words

  1. hermeneutic,
  2. hermeneutical,
  3. hermeneutics,
  4. hermes,
  5. hermes trismegistus,
  6. hermetically,
  7. hermeticism,
  8. hermetism,
  9. hermione,
  10. hermit

Also her·met·i·cal.

Origin of hermetic

1630–40; < Medieval Latin hermēticus of, pertaining to Hermes Trismegistus, equivalent to Latin Hermē(s) Hermes + -ticus -tic

Related formsun·her·met·ic, adjective

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for hermetic

British Dictionary definitions for hermetic



/ (hɜːˈmɛtɪk) /


sealed so as to be airtight
hidden or protected from the outside world
Derived Formshermetically, adverb

Word Origin for hermetic

C17: from Medieval Latin hermēticus belonging to Hermes Trismegistus, traditionally the inventor of a magic seal


/ (hɜːˈmɛtɪk) /


of or relating to Hermes Trismegistus or the writings and teachings ascribed to him
of or relating to ancient science, esp alchemy
esoteric or recondite

Word Origin for Hermetic

see hermetic

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

Word Origin and History for hermetic



c.1600 (implied in hermetically), "completely sealed," also (1630s) "dealing with occult science or alchemy," from Latin hermeticus, from Greek Hermes, god of science and art, among other things, identified by Neoplatonists, mystics, and alchemists with the Egyptian god Thoth as Hermes Trismegistos "Thrice-Great Hermes," who supposedly invented the process of making a glass tube airtight (a process in alchemy) using a secret seal.

Online Etymology Dictionary, © 2010 Douglas Harper

Medicine definitions for hermetic


[ hər-mĕtĭk ]


Completely sealed, especially against the escape or entry of air.
Related formsher•meti•cal•ly adv.

The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.