paraquat
From Longman Dictionary of Contemporary Englishparaquatpar‧a‧quat /ˈpærəkwɒt $ -kwɑːt/ noun [uncountable] HBPTIa strong poison used to kill weeds → weed killerExamples from the Corpusparaquat• But hares were declining before paraquat was introduced, and the effects of agricultural chemicals on wildlife are notoriously difficult to assess.• There must be something she ate that would act as a cover for paraquat or whatever he was going to use.