any of various North American plants of the genus Eupatorium, esp E. perfoliatum, which has flat clusters of small white flowers: family Asteraceae (composites)
Also called: agueweed, feverwort, thoroughwort
boneset in American English
(ˈboʊnˌsɛt)
US
noun
any of several plants of the composite family; esp., a plant (Eupatorium perfoliatum) with flat clusters of white flowers, used in folk medicine