defoliant

de·fo·li·ant

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

Origin:
1940–45; defoli(ate) + -ant

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
defoliant (diːˈfəʊlɪənt) [Click for IPA pronunciation guide]
 
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
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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00:10
Defoliant is always a great word to know.
So is ninnyhammer. Does it mean:
a fool or simpleton; ninny.
a stew of meat, vegetables, potatoes, etc.
Etymonline
Word Origin & History

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