Paraquat A poisonous dipyridilium compound used as contact herbicide. Contact with concentrated solutions causes irritation of the skin, cracking and shedding of the nails, and delayed healing of cuts and wounds.
MediLexicon paraquat - Medical Dictionary Definition for Term 'paraquat'
[1. A weedkiller that produces delayed toxic effects on the liver, kidneys, and lungs when ingested; progressive interstitial pneumonia with proliferation of alveolar lining cells may develop.