hermetically

[hur-met-ik-lee]
adverb
so as to be airtight: hermetically sealed.

Origin:
1595–1605; hermetic + -ally

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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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

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
So an expensive hermetically sealed coffin is required if embalming is rejected.
One answer is to use the energy to compress air, which can be squirrelled away
  in hermetically sealed underground caverns.
Scientists also designed a new hermetically sealed gondola from magnesium alloy.
However, the hermetically sealed box test should have negated that possibility.
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