This word is acceptable for play in the UK dictionary that is being used in the following games:

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n. a chemical agent that destroys unwanted plants (weeds) but not wanted ones (crops etc)

n. a chemical agent that destroys plants or inhibits their growth

"DuPont initially touted Optimum GAT to farmers as an alternative to them buying seeds equipped with Monsanto's gene for surviving glyphosate, the active ingredient in Monsanto's Roundup weedkiller."

chemical substance    chemical   

herbicide   

linuron    Agent Orange    simazine    atrazine    silvex    paraquat   

weedicide   

slipped0.33    somesort    meat-grinder    degreaser    centre    subarea    decentralisation    tabun    voltameter    subsector