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defoliant

American  
[dee-foh-lee-uhnt] / diˈfoʊ li ənt /

noun

  1. a preparation for defoliating plants.


defoliant British  
/ diːˈfəʊlɪənt /

noun

  1. a chemical sprayed or dusted onto trees to cause their leaves to fall, esp to remove cover from an enemy in warfare

"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

Etymology

Origin of defoliant

First recorded in 1940–45; defoli(ate) + -ant

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:

More than half of that spraying involved the dioxin-contaminated defoliant Agent Orange.

From Salon Apr. 30, 2025

Some deforestation can be traced back to the Vietnam War, when forests were sprayed with the toxic defoliant known as Agent Orange.

From National Geographic Dec. 20, 2023

He returned regularly to Vietnam after the war to shoot assignments, run photo workshops and photograph victims of Agent Orange, a carcinogenic defoliant sprayed by the American military to clear jungles there.

From New York Times Aug. 24, 2022

The documentary “The People vs. Agent Orange” follows two women in their 70s who are pushing for accountability regarding the deployment of the toxic defoliant Agent Orange during the Vietnam War.

From Washington Post Mar. 9, 2021

I mentally fist pump and suit up to start on the defoliant.

From "The Last Cuentista" by Donna Barba Higuera

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