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

1895–1900; herb + -i- + -cide

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

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.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
They talk of using herbicides strategically, while continuing mechanical
  methods and introducing biological controls.
It has not yet taken even basic measures to reduce possible damage to public
  health in areas exposed to herbicides.
Chemical herbicides can help you reestablish control over a lawn where weeds
  have gained the upper hand.
Herbicidal soaps, corn gluten meal and biological controls are effective
  alternatives to chemical herbicides.
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