Etymology
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defoliate (v.)

"deprive of leaves, strip the leaves from," 1793, perhaps a back-formation from defoliation. Earlier in this sense was defoil (c. 1600), which was identical in form with a verb meaning "to trample underfoot." Related: Defoliated; defoliating.

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Definitions of defoliate
1
defoliate (v.)
strip the leaves or branches from;
defoliate the trees with pesticides
2
defoliate (adj.)
deprived of leaves;
Synonyms: defoliated
From wordnet.princeton.edu