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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
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. 2014.
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Examples from the web for air lock
  • It has an air lock, so the crews can put on spacesuits, and go outside and do work.
  • Please confirm air lock panels are provided by contractor.
Encyclopedia Article for air lock

device that permits passage between regions of differing air pressures, most often used for passage between atmospheric pressure and chambers in which the air is compressed, such as pneumatic caissons and underwater tunnels. The air lock also has been used as a design feature of space vehicles; on March 18, 1965, the Soviet cosmonaut Aleksey Leonov passed through an air lock to become the first man to walk in space

Learn more about air lock with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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