defoliant

defoliant

[dee-foh-lee-uhnt]
noun
a preparation for defoliating plants.

Origin:
1940–45; defoli(ate) + -ant

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World English Dictionary
defoliant (diːˈfəʊlɪənt)
 
n
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 10th Edition
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Word Origin & History

defoliant
1943, from defoliate.
Online Etymology Dictionary, © 2010 Douglas Harper
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