• WordNet 3.6
    • n pinkroot a fungal disease of onions
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Webster's Revised Unabridged Dictionary
    • Pinkroot (Bot) A perennial North American herb (Spigelia Marilandica), sometimes cultivated for its showy red blossoms. Called also Carolina pink Maryland pinkroot, and worm grass.
    • Pinkroot (Bot) An annual South American and West Indian plant (Spigelia Anthelmia).
    • Pinkroot (Med) The root of Spigelia Marilandica, used as a powerful vermifuge; also, that of Spigelia Anthelmia. See definition 2 (below).
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Century Dictionary and Cyclopedia
    • n pinkroot The root of the Carolina or Indian pink, Spigelia Marilandica, a well-known vermifuge officinal in the United States: in large doses narcotic-poisonous.
    • n pinkroot The plant itself, an herb with showy flowers, red outside, yellow inside, common southward in the United States. Also called Maryland pinkroot and worm-grass. The name extends to the species S. Anthelmia of the West Indies and South America, there used as a similar remedy.
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In literature:

Pinkroot has a pleasant, aromatic odor, and the taste is described as sweetish, bitter and pungent.
"Ginseng and Other Medicinal Plants" by A. R. (Arthur Robert) Harding