fire door

American  

noun

1. a door through which a boiler or furnace is fired or through which the fire is inspected.

2. a fireproof or fire-resistant door in a building, intended to isolate an area from fire.

---

fire door British  

noun

1. a door made of noncombustible material, the purpose of which is to prevent a fire from spreading within a building

2. a similar door, leading to the outside of a building, that can be easily opened from inside; emergency exit

---

Etymology

Origin of fire door

First recorded in 1830–40

Example Sentences

Before fleeing the fire, Kovac loaded all his valuables into a room wrapped in concrete and equipped with a fire door capable of keeping out smoke and flames for three hours.

From Los Angeles Times • Aug. 10, 2025

Just make sure it is not a fire door, as these cannot function properly if they are propped open.

From BBC • Sep. 22, 2022

The two-story property used to house Altype Fire Door, a fire door factory.

From New York Times • Apr. 14, 2020

I opened a fire door, which locked closed behind me and I took in my surroundings.

From The Guardian • Feb. 14, 2019

The fighters rolled onto the floor, right to the fire door, where I had no doubt Rachel and Ema would make their escape.

From "Shelter (Book One): A Mickey Bolitar Novel" by Harlan Coben