From Longman Dictionary of Contemporary Englishpoison ivyˌpoison ˈivy noun [uncountable] HBPa North American plant that has an oily substance on its leaves that makes your skin hurt and itch if you touch it
Examples from the Corpus
poison ivy• The back of his knee itched from poison ivy.• A thin waxy slip of poison ivy was entwined around one of the legs.• Garnish with a fruit and a sprig of poison ivy.• Even then you'd be a weed or poison ivy.• What is the poison ivy that so jealously guards our dark fortress? 