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POISON IVY

Definition:

[noun] dermatitis resulting from contact with the poison ivy plant; "my poison ivy is drying up"
[noun] climbing plant common in eastern and central United States with ternate leaves and greenish flowers followed by white berries; yields an irritating oil that causes a rash on contact
Synonyms: markweed, poison mercury, poison oak, Toxicodendron radicans, Rhus radicans