Definition of hermetic adjective from the Oxford Advanced American Dictionary

     

    hermetic

     adjective
    adjective
    NAmE//hərˈmɛt̮ɪk//
     
     
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  1. 1(technology) tightly closed so that no air can escape or enter synonym airtight
  2. 2(formal) (disapproving) closed and difficult to become a part of the strange, hermetic world of the theater
hermetically
 
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NAmE//hərˈmɛt̮ɪkli//
 
adverb a hermetically sealed container
See the Oxford Advanced Learner's Dictionary entry: hermetic