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English definition of “airlock”

airlock

noun [C] uk   /ˈeə.lɒk/ us    /ˈer.lɑːk/

airlock noun [C] (ROOM)

a room between two areas that have different air pressure, allowing you to go from one area to the other: Airlocks are commonly found on submarines and manned spacecraft.Parts of ships and boatsSpace travel

airlock noun [C] (BUBBLE)

a bubble in a pipe that prevents liquid from flowing along itPlumbing and pipes and sewage
(Definition of airlock from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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