fire door


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!

Learn More about fire door

Statistics for fire door

Look-up Popularity

More from Merriam-Webster on fire door

Spanish Central: Translation of fire door

Comments on fire door

What made you want to look up fire door? Please tell us where you read or heard it (including the quote, if possible).


esteemed in general opinion

Get Word of the Day daily email!

Test Your Vocabulary

What did you just call me?! A Quiz

  • rows-of-various-emoji
  • If a member of the audience describes your speech as bombastic, does that person mean it is:
True or False

Test your knowledge - and maybe learn something along the way.

Bee Cubed

Test Your Knowledge - and learn some interesting things along the way.


Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!