transitive verb

: to cool by means of air
specifically : to cool the cylinder or cylinders of (an internal-combustion engine) by air without the use of any intermediate medium (as water or oil)
air-cooled adjective
air cooling noun

Word History


back-formation from air-cooled & air cooling

First Known Use

1900, in the meaning defined above

Time Traveler
The first known use of air-cool was in 1900

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!

Dictionary Entries Near air-cool

Cite this Entry

“Air-cool.” Dictionary, Merriam-Webster, Accessed 23 Jul. 2024.

Kids Definition


: to cool (as an internal combustion engine) by air
Love words? Need even more definitions?

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