ace·​to·​chlor | \ ə-ˈsē-tō-ˌklȯr How to pronounce acetochlor (audio) \

Definition of acetochlor

: 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

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 acetochlor

circa 1971, in the meaning defined above

History and Etymology for acetochlor

aceto- + -chlor (as in alachlor)

Keep scrolling for more

Learn More about acetochlor

Statistics for acetochlor

Look-up Popularity

Time Traveler for acetochlor

The first known use of acetochlor was circa 1971

See more words from the same year

Comments on acetochlor

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


a wrong name or inappropriate designation

Get Word of the Day daily email!

Test Your Vocabulary

Summer 2019 Words of the Day Quiz

  • a-bowl-of-peach-sorbet-with-cut-peaches-next-to-it
  • Which is a synonym of desideratum?
Spell It

Can you spell these 10 commonly misspelled words?

Word Winder's CrossWinder

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!