Definition of "poison ivy" [poison ivy]

• A North American shrub or vine (Toxicodendron radicans syn. Rhus radicans) that has compound leaves with three leaflets, small green flowers, and whitish berries and that causes a rash on contact. (noun)
• A skin rash caused by contact with this plant. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Blisters of poison ivy beaded up on his hands and forearms from his flight through the flat/woods."