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air lock

noun
1.
Civil Engineering. an airtight chamber permitting passage to or from a space, as in a caisson, in which the air is kept under pressure.
2.
the impedance in the functioning of a pump or a system of piping caused by the presence of an air bubble; vapor lock.
Origin of air lock
1855-1860
1855-60

air-lock

[air-lok] /ˈɛərˌlɒk/
verb (used with object)
1.
to place in or confine to an air lock:
to air-lock divers before they descend.
Origin
1855-60
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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