paraquat
/ˈpærəkwɒt/noun
mass noun
- a toxic fast-acting herbicide, which becomes deactivated in the soil百草枯, 对草快（一种快速除草剂）。
词源
1960s: from PARA-1 (in sense 2) + QUATERNARY （it is a quaternary ammonium salt containing pyridine rings linked at the para-position）.