• synonyms


See more synonyms for hermetic on Thesaurus.com
  1. made airtight by fusion or sealing.
  2. not affected by outward influence or power; isolated.
  3. (sometimes initial capital letter) of, relating to, or characteristic of occult science, especially alchemy.
  4. (initial capital letter) of or relating to Hermes Trismegistus or the writings ascribed to him.
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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. 2018

Related Words for hermetical

esoteric, magical, secluded, latent, mysterious, covert, undisclosed, unknown, private, dark, underground, concealed, clandestine, invisible, obscure, buried, occult, veiled, disguised, screened

Examples from the Web for hermetical

Historical Examples of hermetical

  • Now, however, the sealing of the South was all but hermetical.

    Abraham Lincoln, Vol. II

    John T. Morse

  • Others were making their entrance upon the great work, after the hermetical method.

  • His measure of usefulness became full in 1798 when the hermetical seal of death closed his bright career.

  • A sect of hermetical philosophers, founded in the fifteenth century, who were engaged in the study of abstruse sciences.

British Dictionary definitions for hermetical



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

Word Origin for hermetic

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


  1. of or relating to Hermes Trismegistus or the writings and teachings ascribed to him
  2. of or relating to ancient science, esp alchemy
  3. esoteric or recondite
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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 hermetical



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.

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Online Etymology Dictionary, © 2010 Douglas Harper

hermetical in Medicine


  1. Completely sealed, especially against the escape or entry of air.
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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.