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

Keep scrolling for more

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 30 Sep. 2022.

Keep scrolling for more

Love words? Need even more definitions?

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

The Great British Vocabulary Quiz

  • union jack speech bubble
  • Named after Sir Robert Peel, what are British police called?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

Universal Daily Crossword

A daily challenge for crossword fanatics.