poison ivy

(noun) dermatitis resulting from contact with the poison ivy plant. Synonyms: poison ivy. Example: "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: poison ivy, markweed, poison mercury, poison oak, Toxicodendron radicans, Rhus radicans.