noun ace·tyl·ac·e·tone \ə-ˈsē-təl-ˈa-sə-ˌtōn, ˈa-sə-təl-, ˈa-sə-ˌtēl-\

Definition of acetylacetone



  1. :  a colorless liquid diketone of pleasant odor known in two forms [keto form CH3COCH2COCH3 and enol form CH3COCHC(OH)CH3] made in various ways (as by the reaction of sodium with acetone and ethyl acetate); 2,4-pentanedione

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.

Join MWU now and get access to America’s largest dictionary, with:

  • 300,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

Origin and Etymology of acetylacetone

International Scientific Vocabulary acetyl + acetone

First Known Use: 1887

Seen and Heard

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


to cast off or become cast off

Get Word of the Day daily email!