Longman Dictionary of Contemporary English homepage

Date: 1900-2000
Language: Medieval Latin
Origin: defoliare, from Latin folium 'leaf'

defoliant

 noun
     
de‧fo‧li‧ant [uncountable and countable] formal
HBP a chemical substance, used especially in war, that makes all the leaves of plants drop off
Definition from the Longman Dictionary of Contemporary English
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