Dictionary.com
Thesaurus.com
Synonyms

weedkiller

British  
/ ˈwiːdˌkɪlə /

noun

  1. a substance, usually a chemical or hormone, used for killing weeds

"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

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.

Roundup weedkiller, which contains glyphosate, was originally developed by Monsanto in the 1970s.

From BBC • May 6, 2026

The potential settlement is Bayer’s latest attempt to end the mass litigation it faces for the weedkiller and fend off future lawsuits.

From The Wall Street Journal • Apr. 20, 2026

German agrichemical giant Bayer said Wednesday that a US judge had granted preliminary approval for a multi-billion-dollar class settlement proposed by its subsidiary Monsanto over claims the Roundup weedkiller causes blood cancer.

From Barron's • Mar. 4, 2026

The weedkiller has come under increasing scrutiny as Bayer, Roundup’s maker, has faced thousands of lawsuits alleging it failed to warn people it could cause cancer.

From Los Angeles Times • Mar. 1, 2026

Bayer stock slumped on Wednesday as the German giant set a preliminary accord to cap litigation over its weedkiller Roundup.

From MarketWatch • Feb. 18, 2026

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.