ace·​to·​chlor ə-ˈsē-tō-ˌklȯr How to pronounce acetochlor (audio)
: an herbicide C14H20ClNO2 that is typically applied before the emergence of crop seedlings aboveground and is used to control grasses and broad-leaved weeds
acetochlor, a herbicide commonly used by farmers to control weeds in corn.Mary Divine & Dennis Lien, St. Paul (Minnesota) Pioneer Press, 26 Sept. 2007

Word History


aceto- + -chlor (as in alachlor)

First Known Use

circa 1971, in the meaning defined above

Time Traveler
The first known use of acetochlor was circa 1971

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 acetochlor

Cite this Entry

“Acetochlor.” Dictionary, Merriam-Webster, Accessed 14 Apr. 2024.

Love words? Need even more definitions?

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