From Longman Dictionary of Contemporary Englishfire doorˈfire ˌdoor noun [countable] TBBa heavy door in a building that is kept closed to help to prevent a fire from spreading
Examples from the Corpus
fire door• On the landing above the disco a fire door swung slowly to a close.• They were standing on the lower section, with a fire door leading on to a split-level landing.• They were moving away from the fire door when there was a loud report, like a large cannon going off.• Squatting in front of the fire door, Jess battled with a little pyramid of dried hay and sticks she had built under the copper. 