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Meaning of “hermetically sealed” in the English Dictionary

"hermetically sealed" in British English

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hermetically sealedadjective

uk   /hɜːˌmet.ɪ.kəl.i ˈsiːld/  us   /hɚˌmet̬.ɪ.kəl.i ˈsiːld/
specialized engineering A hermetically sealed container or space is so tightly closed that no air can leave or enter it.
disapproving separated and protected from very different conditions outside, in an unnatural way: We drove past a row of squalid shacks on the way to our hotel, where we slept in air-conditioned, hermetically sealed rooms.
(Definition of hermetically sealed from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
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