What does defoliate mean?
To defoliate is to remove the leaves from a plant, tree, or area of vegetation — either deliberately, as when farmers apply chemicals to cotton before harvest so the bolls can be picked mechanically, or as a result of natural processes like autumn senescence, drought, insect damage, or disease. The verb works transitively ('the spraying defoliated the forest') and intransitively ('the maples began to defoliate early'). It derives from Latin folium, meaning leaf, via the English word foliage. Although defoliation has legitimate agricultural uses, the term is most famously associated with warfare: during the Vietnam War, the U.S. military sprayed the herbicide Agent Orange over millions of acres of jungle, giving 'defoliate' lasting connotations of environmental destruction. Related forms include defoliation (the process), defoliant (a chemical agent), and defoliator (an agent or organism, often an insect, that removes leaves).
verbTo cause the leaves of a plant or tree to fall off, whether naturally, by disease, or by the deliberate application of a chemical agent; also, to strip a plant of its leaves.
- To deprive a plant of its leaves, especially by applying a chemical agent (defoliant).
- (of a plant) To shed its leaves, as in autumn or due to stress or disease.
"The herbicide was used to defoliate vast stretches of jungle during the war."
"Farmers sometimes defoliate cotton plants before harvest to make mechanical picking easier."
"Drought stress caused many of the young oaks to defoliate prematurely that summer."
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of defoliate
Defoliate comes from the Latin folium, meaning 'leaf', combined with the prefix de- indicating removal. The word entered English in the early 19th century, formed on the model of earlier words built from the same root such as foliage and folio, both ultimately from folium. Cognates sharing this Latin root include portfolio (literally a carrying case for loose sheets or 'leaves' of paper) and defoliant, a 20th-century coinage for chemical agents designed to strip vegetation.
Related word forms
How defoliate is actually used
Register: formal to technical. Most common in agricultural, forestry, and military contexts; the transitive sense (applying a defoliant) is more frequent than the intransitive sense (a plant shedding leaves). The word carries a strongly negative connotation when associated with chemical warfare, particularly Agent Orange in Vietnam.
Easily confused with defoliate
'Defoliated' (past tense of defoliate) means having lost its leaves, while 'defaulted' means failed to fulfill an obligation such as a debt payment.
'Depopulate' means to reduce the number of inhabitants in a place, whereas 'defoliate' specifically concerns removing leaves from plants.