- a door through which a boiler or furnace is fired or through which the fire is inspected.
- a fireproof or fire-resistant door in a building, intended to isolate an area from fire.
Origin of fire door
First recorded in 1830–40
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for fire door
The fire-door, for the supply of fuel, appears at M, fig. 116.The Steam Engine Explained and Illustrated (Seventh Edition)</p>
What is the result of opening the fire-door when the engine is working steam?The Traveling Engineers' Association
Old Hobden let himself down on the coals by the fire-door. 'Puck of Pook's Hill
Except at the fire-door end, the firebox was completely surrounded by water.
The chest is heated from the subjacent grate c, upon which the fuel is laid, through the fire-door d.
- a door made of noncombustible material, the purpose of which is to prevent a fire from spreading within a building
- a similar door, leading to the outside of a building, that can be easily opened from inside; emergency exit
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012