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  • paraquat
    paraquat
    noun
    a toxic herbicide, C 1 2 H 1 4 N 2 ⋅2CH 3 SO 4 , applied to food and flower crops and to highway borders as a defoliant and weed-killer.
  • Paraquat
    Paraquat
    noun
    a yellow extremely poisonous soluble solid used in solution as a weedkiller
Synonyms

paraquat

American  
[par-uh-kwaht] / ˈpær əˌkwɑt /

noun

Chemistry.
  1. a toxic herbicide, C 1 2 H 1 4 N 2 ⋅2CH 3 SO 4 , applied to food and flower crops and to highway borders as a defoliant and weed-killer.


Paraquat British  
/ ˈpærəˌkwɒt /

noun

  1. a yellow extremely poisonous soluble solid used in solution as a weedkiller

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

paraquat Scientific  
/ părə-kwŏt′ /
  1. A toxic compound used as a herbicide, especially in its colorless, dichloride form (C 12 H 14 Cl 2 N 2) or in its yellow, bismethyl sulfate form (C 14 H 20 N 2 O 8 S 2). Paraquat is used primarily to control grass and weeds. Its use in the United States is restricted because of its high level of toxicity.


Etymology

Origin of paraquat

1960–65; para- 1 + quat(ernary), in reference to the bond between the two pyridyl groups, which is in the para position with respect to their quaternary nitrogen atoms

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

See Examples For:

“We paid thousands of dollars to have it analyzed. … I mean, the paraquat thing was totally scientifically wrong.”

From Slate Dec. 23, 2025

The federal government banned the use of the weedkiller paraquat on golf courses in 2021.

From The Wall Street Journal Oct. 31, 2025

“In California, paraquat helps farmers control weeds in important crops, removing hazards for field work and preventing weeds from taking water and nutrients from crops.”

From Los Angeles Times Apr. 8, 2024

California is the nation’s top user of paraquat, spraying millions of pounds annually, she said.

From Los Angeles Times Apr. 8, 2024

“We would like to stress that paraquat is safe when used as directed,” Das said.

From Los Angeles Times Apr. 8, 2024

Paraquat is a herbicide commonly used on farms and in yards for weed control.

From The Wall Street Journal Oct. 31, 2025

Paraquat is manufactured by Syngenta, a Switzerland-based company that is owned by the Chinese government.

From Los Angeles Times Apr. 8, 2024

He pointed to the most recent epidemiological study - carried out by UCLA's Department of Neurology and published this month - to find that Paraquat exposure increases the risk of Parkinson's Disease.

From BBC Feb. 12, 2024

In a statement provided to the BBC, it said: "Despite decades of investigation and myriad epidemiological and laboratory studies, no scientist or doctor has ever concluded in a peer-reviewed scientific analysis that Paraquat causes Parkinson's."

From BBC Feb. 12, 2024

Paraquat is 28 times more toxic than another controversial herbicide, Roundup, according to a report from the Pesticide Action Network.

From Los Angeles Times Dec. 20, 2023

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