any of various plants having seeds or other parts used in medicine to treat worm infestation, esp an American chenopodiaceous plant, Chenopodium anthelminticum (or C. ambrosioides) (American wormseed), and the santonica plant
2.
the part of any of these plants that is used as an anthelmintic
wormseed in American English
(ˈwɜrmˌsid)
noun
1.
any of a number of plants whose seeds are used in medicine as a remedy for worms, including various goosefoots, esp. the American wormseed (Chenopodium ambrosioides)