from The American Heritage® Dictionary of the English Language, 4th Edition
- n. 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
- n. A fireproof door designed to stop fires spreading through buildings.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a fire-resistant door that can be closed to stop the spread of a fire
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