poison ivy
noun
Date: 1784
1. a climbing plant ( Toxicodendron radicans syn. Rhus radicans ) of the cashew family that is especially common in the eastern and central U.S., that has ternate leaves, greenish flowers, and white berries, and that produces an acutely irritating oil causing a usually intensely itching skin rash, any of several plants closely related to poison, a skin rash caused by poison
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