From The Collaborative International Dictionary of English v.0.48:

Pinkroot \Pink"root`\, n.
   1. (Med.) The root of Spigelia Marilandica, used as a
      powerful vermifuge; also, that of Spigelia Anthelmia.
      See definition 2 (below).
      [1913 Webster]

   2. (Bot.)
      (a) A perennial North American herb ({Spigelia
          Marilandica}), sometimes cultivated for its showy red
          blossoms. Called also Carolina pink, {Maryland
          pinkroot}, and worm grass.
      (b) An annual South American and West Indian plant
          (Spigelia Anthelmia).
          [1913 Webster]
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