Definition of noxious weed in English:

noxious weed

noun

  • A weed which is considered to be harmful to the environment or animals, especially one which may be the subject of regulations governing attempts to control it:

    ‘a trial of remote-controlled helicopter technology in the fight against noxious weeds, mosquitoes, and other pests’
    [as modifier] ‘most states have their own noxious weed laws’