[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
Corn gluten meal acts as a preemergence herbicide for lawns and agricultural
  crops, destroying weeds before they germinate.
For chemical control, use a selective postemergence herbicide.
For chemical control, use a selective postemergence herbicide labeled for
  dandelions in turf.
For chemical control, you can use a pre-emergence herbicide containing
  trifluralin around ornamentals.
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