Noun weed killer has 1 sense
  1. herbicide, weedkiller, weed killer - a chemical agent that destroys plants or inhibits their growth
    --1 is a kind of chemical
    --1 has substances: arsenic, As, atomic number 33
    --1 has particulars:
     Agent Orange; atrazine; linuron; paraquat; silvex; simazine
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