For Herbicide we have terms and definitions in 11 topics. The topics are Agriculture, Biotechnology, Cancer, Environment, Forestry, Gardening, Genetics and Food, Nature, Pests, Sanitation and Science.

An agent that stops plant growth or kills a plant.
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A chemical compound that kills targeted plants (weeds).
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A chemical that kills plants.
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A chemical pesticide designed to control or destroy plants, weeds, or grasses.
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A chemical substance sprayed on plants so it will kill them
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As much as I hate the use of this word and anything connected to it, it is any chemical that will kill a plant. There are both selective and non-selective herbicides. Selectives only killing a specific plant and the non-selective killing a larger segment of plants.
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a weed killer used in the production of crops.
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A chemical used to kill plants.
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A material used specifically to manage or prevent damage caused by weeds. Sometimes generalized to be synonymous with pesticides.
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A compound, usually a synthetic organic chemical, used to control plant growth.
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An agent used to destroy or inhibit plant growth
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