poison ivy definition

  • noun:
    • A North American shrub or vine (Toxicodendron radicans syn. Rhus radicans) who has compound leaves with three leaflets, little green blossoms, and whitish berries hence triggers a rash on contact.
    • A skin rash brought on by connection with this plant.
    • A woody vine plant in the family Anacardiaceae well-known for its ability to produce urushiol, a skin irritant that causes an itching rash and blistering for most people.
    • an American woody creeper (Rhus Toxicodendron), with trifoliate leaves, and greenish-white fruits. It's extremely toxic to the touch for many people.
    • a poisonous climbing plant (formerly Rhus Toxicodendron, or Rhus radicans, today categorized as Toxicodendron radicans) of united states. It's quite common as a climbing vine, specifically found on tree trunks, or walls, or as a low, dispersing vine or as a shrub. As a reduced vine it grows well in gently shaded areas, recognizable by growing in groups of three leaves. Its leaves tend to be trifoliate, rhombic-ovate, and variously notched. Its form varies slightly from place to area, ultimately causing some conjecture so it may contain several species. Many people tend to be poisoned by it, while some look resistant to its effects. Touching the leaves may keep a residue of an oil from the epidermis, and when not cleaned down rapidly, sensitive regions of epidermis be reddened and develop numerous small blisters, enduring for all times to many months, and causing a persistent itch. The toxic reaction is due to an oil, within all components of the plant except the pollen, known as urushiol, the energetic component of which is the mixture pentadecylacatechol (in accordance with Charles H. Booras). See Poison sumac. It really is linked to poison oak, and it is called mercury.
    • A shrub-vine of united states, Rhus Toxicodendron, sometimes low and erect, but commonly a climber on trees, rocks, walls, etc.
    • climbing plant typical in eastern and main US with ternate leaves and greenish blossoms accompanied by white fruits; yields an irritating oil that creates a rash on contact
    • dermatitis resulting from connection with the poison ivy plant

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