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firestop

[fahyuh r-stop] /ˈfaɪərˌstɒp/
noun
1.
any object built into a building frame to block a concealed hollow space through which a fire might pass from one part of the building to another.
Origin
1895-1900
1895-1900; Americanism; fire + stop
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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