from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A door made of fire-resistant material that can be closed to prevent the spread of fire.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun A fireproof door designed to stop fires spreading through buildings.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun a fire-resistant door that can be closed to stop the spread of a fire


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