ˌyüpəˈtōrēəm noun
Etymology: New Latin, from Greek eupatorion hemp agrimony, from Mithridates VI Eupator died 63B.C. king of Pontus
1. capitalized : an immense genus of chiefly tropical herbs (family Compositae) having heads of white or purplish flowers arranged in cymose clusters, a capillary pappus, and 5-angled achenes — see boneset , hemp agrimony , joe-pye weed , mistflower
2. -s : any plant of the genus Eupatorium