airlock

air-lock

[air-lok]
verb (used with object)
to place in or confine to an air lock: to air-lock divers before they descend.

Origin:
1855–60

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
airlock (ˈɛəˌlɒk)
 
n
1.  a bubble in a pipe causing an obstruction or stoppage to the flow
2.  an airtight chamber with regulated air pressure used to gain access to a space that has air under pressure

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