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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 ​tightlyclosed that no ​air can ​leave or ​enter it.
disapproving separated and ​protected from very different ​conditionsoutside, in an ​unnatural way: We ​drove past a ​row of ​squalidshacks on the way to ​ourhotel, 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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