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Definitions:
Noun
poison ivy
Definition: dermatitis resulting from contact with the poison ivy plant; "my poison ivy is drying up"
poison ivy
markweed
poison mercury
poison oak
Toxicodendron radicans
Rhus radicans
Definition: 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
Definition: Any of three ivy-like species of Toxicodendron, known for their ability to cause an itching rash and blistering for most people, through urushiol, an oil that is a skin irritant.