wartweed

/ˈwɔrtˌwid/
noun
  1. A common name for certain plants, especially spurges (Euphorbia species), once believed to cure warts.
    • In old folk medicine, wartweed was applied directly to the skin.
    • Children were warned not to touch wartweed, as it could irritate the skin.
    • The farmer identified the plant as wartweed because of its milky sap.