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2017 Word of the Year

vapor barrier

noun, Building Trades.
1.
a layer of material, as plastic film or foil, used to protect installed insulation by retarding the transmission of moisture from the interior environment.
Origin of vapor barrier
1940-1945
First recorded in 1940-45
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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10
12
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