weed killer weed·kil·ler uncommon noun 1. a chemical agent that destroys plants or inhibits their growth Synonymsherbicideweedkillerweed killer Related words Broader terms chemical Narrower terms Agent Orangeatrazinelinuronparaquatsilvexsimazine Part of arsenic WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.
