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English definition of “hermetically sealed”

hermetically sealed

adjective uk   /hɜːˌmet.ɪ.kliˈsiːld/ us    /hɚˌmet̬-/
specialized engineering describes a container or space that 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 Learners Dictionary & Thesaurus © Cambridge University Press)
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