hermetically sealed

adjective

/hɜːˌmet.ɪ.kliˈsiːld/

/hɚˌmet̬-/

Definition

› specialized describes a container or space that is so tightly closed that no air can leave or enter itOpen and closed › 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.Separateness and isolation in spaceAlone

(Definition of hermetically sealed adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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