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8 Words That Are Older Than You Think

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
1855-1860
1855-60
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for airlock

airlock

/ˈɛəˌlɒk/
noun
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
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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