Definition of air lock
1
: an intermediate chamber with two airtight doors or openings to permit passage between two dissimilar spaces (such as two places of unequal atmospheric pressure)
2
: a stoppage of flow caused by air being in a part where liquid ought to circulate
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Merriam-Webster unabridged
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Time Traveler for air lock
The first known use of air lock was in 1840
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