Pronunciation: (fīur'trap"), [key]
1. a building that, because of its age, material, structure, or the like, is esp. dangerous in case of fire.
2. (in a building) any arrangement of structural, flooring, and finish members creating concealed passages through which fire can spread to other parts of the building.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.