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noun markweed n. A climbing plant (Toxicodendron radicans) common in eastern and central U. S. with ternate leaves and greenish flowers followed by white berries. It yields an irritating oil that causes a rash on contact; commonly called poison ivy. Synonyms: poison ivy, poison mercury, poison oak, Toxicodendron radicans, Rhus radicans.
Collaborative International Dictionary of English 0.48
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