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|Noun||1.||markweed - 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|
genus Toxicodendron, Toxicodendron - in some classifications: comprising those members of the genus Rhus having foliage that is poisonous to the touch; of North America and northern South America
poisonous plant - a plant that when touched or ingested in sufficient quantity can be harmful or fatal to an organism