GNU Collaborative International Dictionary of English

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