air plug


Definition of air plug

: a removable plug screwed into a watertight manhole or scuttle cover

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!

First Known Use of air plug

1864, in the meaning defined above

Keep scrolling for more

Learn More about air plug

Time Traveler for air plug

Time Traveler

The first known use of air plug was in 1864

See more words from the same year

Statistics for air plug

Cite this Entry

“Air plug.” Dictionary, Merriam-Webster, Accessed 28 Oct. 2020.

Comments on air plug

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


Test Your Vocabulary

Namesakes Word Quiz

  • a citrus fruit possibly named after a person
  • Which of the following is a fruit named after a Moroccan seaport?
Spell It

Can you spell these 10 commonly misspelled words?

Dictionary Devil

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!