hermetic

[hur-met-ik]
adjective
1.
made airtight by fusion or sealing.
2.
not affected by outward influence or power; isolated.
3.
(sometimes initial capital letter) of, pertaining to, or characteristic of occult science, especially alchemy.
4.
(initial capital letter) of or pertaining to Hermes Trismegistus or the writings ascribed to him.
Also, hermetical.


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

unhermetic, adjective
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World English Dictionary
hermetic or hermetical (hɜːˈmɛtɪk)
 
adj
1.  sealed so as to be airtight
2.  hidden or protected from the outside world
 
[C17: from Medieval Latin hermēticus belonging to Hermes Trismegistus, traditionally the inventor of a magic seal]
 
hermetical or hermetical
 
adj
 
[C17: from Medieval Latin hermēticus belonging to Hermes Trismegistus, traditionally the inventor of a magic seal]
 
her'metically or hermetical
 
adv

Hermetic (hɜːˈmɛtɪk)
 
adj
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
 
[see hermetic]

Hermetic (hɜːˈmɛtɪk)
 
adj
1.  of or relating to ancient science, esp alchemy
2.  esoteric or recondite
 
[see hermetic]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

hermetic
1605 (implied in hermetically), "completely sealed," also (1637) "dealing with occult science or alchemy," from L. hermeticus, from Gk. 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
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American Heritage
Medical Dictionary

hermetic her·met·ic (hər-mět'ĭk) or her·met·i·cal (-ĭ-kəl)
adj.
Completely sealed, especially against the escape or entry of air.


her·met'i·cal·ly adv.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Hermetic storage bags are commercially available that when sealed are impervious to gas exchange.
For a country that prides itself on its hermetic seal, it has played a pretty
  impressive game for the past eight years.
The bureaucracy is both hermetic and insular, slow-moving in its bulk, at times
  heavy-handed in its armour.
Protecting neighborhoods does not require hermetic seals but support by the
  population.
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