Definition of hermetic adjective from the Oxford Advanced Learner's Dictionary

     

    hermetic

     adjective
    adjective
    BrE BrE//hɜːˈmetɪk//
     
    ; NAmE NAmE//hɜːrˈmetɪk//
     
     
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  1. 1(specialist) 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 theatre
  3. Word Origin mid 17th cent. (in sense (2)): from modern Latin hermeticus, from Hermes (the messenger of the gods in Greek mythology), identified with Thoth (a moon god in Egyptian mythology), regarded as the founder of alchemy and astrology.
See the Oxford Advanced American Dictionary entry: hermetic