(n) low spreading tropical American shrub with long slender leaves used to make a mildly stimulating drink resembling tea; sometimes placed in genus Eupatorium, Syn. Ayapana triplinervis, Eupatorium aya-pana
(n) perennial herb of southeastern United States having white-rayed flower heads; formerly used as in folk medicine, Syn. Eupatorium perfoliatum, thoroughwort, agueweed
(n) American herb having flat-topped clusters of small white flower heads; reputedly a cause of trembles and milk sickness; sometimes placed in genus Eupatorium, Syn. Eupatorium rugosum, Ageratina altissima, white sanicle
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 ]