de‧fo‧li‧ant /diːˈfəʊliənt $ -ˈfoʊ-/
noun [uncountable and countable] formal[
Date: 1900-2000;
Language: Medieval Latin;
Origin: defoliare, from Latin folium 'leaf']
a chemical substance, used especially in war, that makes all the leaves of plants drop off
[TahlilGaran] Dictionary of Contemporary English ▲