SINCE 1828

An Encyclopædia Britannica Company

acetochlor

noun ace·to·chlor \ ə-ˈsē-tō-ˌklȯr \

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

There's more!

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!

Origin and Etymology of acetochlor

aceto- + -chlor (as inalachlor)

NEW! Time Traveler

First Known Use: circa 1971

See Words from the same year

Seen and Heard

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

show

WORD OF THE DAY

nuncupative

play

spoken rather than written

BROWSE DICTIONARY

Test Your Vocabulary

The Exceptions Quiz III

Which of these words does not mean "nonsense"?

How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

TAKE THE QUIZ

SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ

Words at Play

alt-59ea52ed7b96f

Learned Fools: On Names for Students

Where did we get 'freshman' and 'sophomore'?

alt-59e900afadac6

The Synonyms 'Discover' and 'Invent'

In the past, you could invent fruit.

alt-59e8c3440f453

I'll Have the Us(ual)

Shortening 'usual': easy to say, hard to spell

alt-59e77dc36c593

The Origins of 'Lobbyist'

From the front hallways to the back rooms

Ask the Editors

video-title-words-of-the-year-1066

Words of the Year: 1066

Or, Why Pig Meat is Called 'Pork' and Cow Meat is Called 'Beef'

How Often Is 'Biweekly'?

Don't get us started on 'bimonthly'

video-irregardless-grammar-peeve-blend-of-the-synonyms-irrespective-and-regardless

Irregardless

It is in fact a real word (but that doesn't mean you should use it).

video-moose-goose-weird-plurals

Weird Plurals

One goose, two geese. One moose, two... moose. What's up with that?

Word Games

one-green-toy-robot-amidst-many-red-toy-robots

The Exceptions Quiz III

Which of these things doesn't belong?

Take the quiz

knupfer-painting-solon-before-croesus

Forms of Government Quiz

Name that government! Or something like that.

Take the quiz

How Strong Is Your Vocabulary?

How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

Take the quiz

SCRABBLE® Sprint

SCRABBLE® Sprint

SCRABBLE® fans, sharpen your skills!

Play the game