| markweed | n. A climbing plant (Toxicodendron radicans) common in eastern and central U. S. with ternate leaves and greenish flowers followed by white berries. It yields an irritating oil that causes a rash on contact; commonly called |
| poison ivy | (n) 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, Syn. poison oak, Toxicodendron radicans, markweed, Rhus radicans, poison mercury |