1) Airtight 2) Completely airtight 3) Completely sealed 4) Made airtight 5) Sealed by fusion 6) Sealed so as to be airtight 7) Tight 1) Airtight 2) Sealed 
of, like or pertaining to sorcery or alchemy
• (a.) Alt. of Hermetical
(L. hermeticus) impervious to air; airtight.
Impervious to air, airtight. ... Origin: L. Hermeticus ... (18 Nov 1997) ... 
(hәr-met´ik) impervious to the air.
Ancient teachings based on the concepts & principles taught by Pythagoras, Plato, & Hermes Trismegistus. Text originating from the Mystery cults of the Aegean/Mediterranean as well as from Persia & Chaldea.
sealed by fusion 
Type: Term Pronunciation: her-met′ik Definitions: 1. Airtight; denoting a vessel closed or sealed in such a way that air can neither enter it nor issue from it.
[adj] - completely sealed
hermetic 1. Completely sealed, especially against the escape or entry of air. 2. Impervious to outside interference or influence: the hermetic confines of an isolated life. 3. Having to do with the occult sciences, especially alchemy; magical; alchemic; obscure; difficult to inderstand. Identified by Neoplatonists, mystics, and alchemists with t...
Sealing of an object so it is airtight. 
adjective completely sealed; completely airtight