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firestop

[fahyuh r-stop]
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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.
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Origin of firestop

An Americanism dating back to 1895–1900; fire + stop
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018