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WordReference Random House Unabridged Dictionary of American English © 2024pink′ root′, [Plant Pathol.]- Plant Diseasesa disease of onions and other plants, characterized by pink, withered roots, caused by a fungus, Pyrenochaeta terrestris.
pink•root (pingk′ro̅o̅t′, -rŏŏt′),USA pronunciation n. - Plant Biologythe root of any of various plants belonging to the genus Spigelia, of the logania family, esp. that of S. marilandica of the U.S., that is used as a vermifuge.
- Plant Biologyany of these plants.
- pink1 + root1 1755–65, American
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