2 definitions
for Eupatorium
From The Collaborative International Dictionary of English v.0.48 :
Eupatorium \Eu`pa*to"ri*um\, n. [NL., fr. Eupator, king of
Pontus, said to have used it as a medicine.] (Bot.)
A genus of perennial, composite herbs including hemp
agrimony, boneset, throughwort, etc.
[1913 Webster]
From WordNet (r) 2.0 :
Eupatorium
n : large genus of chiefly tropical herbs having heads of white
or purplish flowers [syn: genus Eupatorium]