airlock
//ˈɛəˌlɒk//
Noun
airlockSingular
airlocksPlural
1
A sealed chamber with two airtight doors, used to allow passage between areas of different air pressure, such as between a spacecraft and outer space or between a submarine and the water.
The astronauts entered the airlock before stepping out into space.
2
A bubble of air that obstructs the flow of liquid through a pipe or tube.
An airlock in the pipe stopped the water from flowing.