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WORDNET DICTIONARY

Noun defoliant has 1 sense

• defoliant(n = noun.substance) - a chemical that is sprayed on plants and causes their leaves to fall off;
is a kind of chemical compound, compound
Derived form verb defoliate₁

THESAURUS

defoliant

acaricide, anthelmintic, antibiotic, antiseptic, bug bomb, carbamate insecticide, chemosterilant, chlorinated hydrocarbon insecticide, contact poison, disinfectant, eradicant, fumigant, fungicide, germicide, herbicide, insect powder, insecticide, microbicide, miticide, organic chlorine, organic phosphate insecticide, pesticide, poison, rat poison, roach paste, roach powder, rodenticide, stomach poison, systemic, systemic insecticide, toxic, toxicant, toxin, venin, venom, vermicide, virus, weed killer

For further exploring for "defoliant" in Webster Dictionary Online