Definition of fire door
1 : the door or opening through which fuel is supplied to a furnace or stove
2 : a fire-resistive door; specifically : an automatic door secured in the open position by a fusible link or thermostatically operated device designed to release the door under the influence of heat and permit its closing by gravity or by weights or other contrivances
Love words? You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.
Start your free trial today and get unlimited access to America's largest dictionary, with:
- More than 250,000 words that aren't in our free dictionary
- Expanded definitions, etymologies, and usage notes
- Advanced search features
- Ad free!
Seen and Heard
What made you want to look up fire door? Please tell us where you read or heard it (including the quote, if possible).