Meaning of “hermetically sealed” in the English Dictionary

british 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)