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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  
/ păr′ə-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.

“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

Syngenta, a leading manufacturer of paraquat, raked in a reported $32 billion in sales in 2023, according to its annual report.

From Los Angeles Times • Jul. 22, 2024

Dacthal was first registered for use in the United States in 1958, paraquat in 1964 and glyphosate in 1974.

From Los Angeles Times • Jul. 22, 2024

Assembly Bill 1963 would sundown the use of the herbicide paraquat, which has been linked to Parkinson’s disease and other health issues, beginning in January 2026.

From Los Angeles Times • Apr. 15, 2024

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.