Usually means: Barrier preventing fire spread through openings.
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We found 5 dictionaries that define the word firestop:

General (4 matching dictionaries)
  1. firestop: Wiktionary
  2. firestop: Infoplease Dictionary
  3. firestop: Dictionary.com
  4. Firestop: Wikipedia, the Free Encyclopedia

Tech (1 matching dictionary)
  1. Glossary of Common Hearth and Heating Terms (No longer online)

Definitions from Wiktionary (firestop)

noun:  (construction) A fire block.
noun:  (construction) Any multi-component system designed to stop fire and smoke from migrating through openings around piping, wiring, ductwork, cable trays, bus ducts, etc., as well as through movement joints in walls and floors that are required to have a fire-resistance rating.

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