Definition of airlock noun from the Oxford Advanced American Dictionary

     

    airlock

     noun
    noun
    NAmE//ˈɛrlɑk//
     
     
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  1. 1a small room with a tightly closed door at each end, which you go through to reach another area at a different air pressure, for example on a spacecraft or submarine
  2. 2a bubble of air that blocks the flow of liquid in a pump or pipe
See the Oxford Advanced Learner's Dictionary entry: airlock