Dermatitis resulting from contact with the poison ivy plant.
2.
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. Synonyms:markweed, poison mercury, poison oak, Rhus radicans, Toxicodendron radicans.
... idea still further and make one's sea bag look like a clump of poison ivy, so that no inspecting officer would ever care to become intimate with its numerous defects in cleanliness. One might even go so far as to camouflage oneself into a writing desk so that when visiting the "Y" or the ... — Biltmore Oswald - The Diary of a Hapless Recruit • J. Thorne Smith, Jr.