• WordNet 3.6
    • n wormseed rank-smelling tropical American pigweed
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Webster's Revised Unabridged Dictionary
    • n Wormseed (Bot) Any one of several plants, as Artemisia santonica, and Chenopodium anthelminticum, whose seeds have the property of expelling worms from the stomach and intestines.
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Century Dictionary and Cyclopedia
    • n wormseed Same as santonica. See santonica and santonin.
    • n wormseed The fruit of the American herb Chenopodium ambrosioides, especially var. anthelminticum, which is often reckoned a distinct species; also, the plant itself. The seed is an officinal as well as a popular vermifuge. It yields wormseed-oil (which see), and is also given in the form of a powder. Distinguished as American wormseed; also called Mexican tea.
    • n wormseed The treacle-mustard, Erysimum cheiranthoides, or primarily its seed, which was formerly a popular vermifuge in England. Also treaclewormseed.
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In literature:

Take wormseed, half a drachm, flour of sulphur, a drachm; mix and make a powder.
"The Works of Aristotle the Famous Philosopher" by Anonymous
Halifax what directions and wormseed she can collect.
"Diary of Anna Green Winslow" by Anna Green Winslow