Definition of poison ivy
1a
: a climbing plant (Toxicodendron radicans synonym 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 irritating oil causing a usually intensely itching skin rash
b
: any of several plants closely related to poison ivy
2
: a skin rash caused by poison ivy
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Merriam-Webster unabridged
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Time Traveler for poison ivy
The first known use of poison ivy was in 1782
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