herbicidal

herbicide

[hur-buh-sahyd, ur-]
noun
a substance or preparation for killing plants, especially weeds.

Origin:
1895–1900; herb + -i- + -cide

herbicidal, adjective
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World English Dictionary
herbicide (ˈhɜːbɪˌsaɪd)
 
n
a chemical that destroys plants, esp one used to control weeds
 
herbi'cidal
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
herbicide  [%PREMIUM_LINK%]     (hûr'bĭ-sīd', ûr'-)  Pronunciation Key 
A pesticide used to kill weeds. Paraquat is a herbicide. Compare fungicide, insecticide, rodenticide.

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