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defoliation (n.)

1650s, "loss of leaves," noun of action from past-participle stem of Late Latin defoliare "shed leaves," from de (see de-) + folium "leaf" (from PIE root *bhel- (3) "to thrive, bloom"). Often especially of the fall of leaves in autumn. Meaning "deliberate destruction of foliage" (for military purposes) is from 1964.

Origin and meaning of defoliation

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Definitions of defoliation from WordNet

defoliation (n.)
the loss of foliage;
defoliation (n.)
causing the leaves of trees and other plants to fall off (as by the use of chemicals);
From wordnet.princeton.edu