From The Collaborative International Dictionary of English v.0.48:

Wormseed \Worm"seed`\, n. (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.
   [1913 Webster]

   Wormseed mustard, a slender, cruciferous plant ({Erysinum
      cheiranthoides}) having small lanceolate leaves.
      [1913 Webster]
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