silvex

noun
sil·​vex | \ˈsil-ˌveks \

Definition of silvex 

: a toxic selective herbicide C9H7Cl3O3 formerly used in controlling woody plants

First Known Use of silvex

1961, in the meaning defined above

History and Etymology for silvex

probably from Latin silva wood + English exterminator

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The first known use of silvex was in 1961

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