- 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)
- the seed of any of these plants
- santonica (sense )
- A tropical American plant (Dysphania ambrosioides syn. Chenopodium ambrosioides) having leaves used as a seasoning and yielding an oil used as an anthelmintic. Also called epazote, Mexican tea.
- Any of several other plants used as an anthelmintic.