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|Noun||1.||weed killer - a chemical agent that destroys plants or inhibits their growth|
Agent Orange - a herbicide used in the Vietnam War to defoliate forest areas
As, atomic number 33, arsenic - a very poisonous metallic element that has three allotropic forms; arsenic and arsenic compounds are used as herbicides and insecticides and various alloys; found in arsenopyrite and orpiment and realgar
atrazine - a synthetic compound derived from triazine that is widely used as an agricultural herbicide; "atrazine is thought to cause cancer and is banned in some European countries"
chemical, chemical substance - material produced by or used in a reaction involving changes in atoms or molecules
linuron - a herbicide that kills weeds without harming vegetables
paraquat - a poisonous yellow solid used in solution as a herbicide
silvex - a herbicide that is effective in controlling woody plants but is toxic to animals
simazine - a herbicide used to control weeds (especially among crops)