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poi·son i·vy, poison oakpoison sumac (poy'zŏn ī'vē),
2. Common name for the cutaneous eruption (Rhus dermatitis) caused by contact with these species of Toxicodendron.
1. A North American shrub or vine (Toxicodendron radicans) that has compound leaves with three leaflets, small green flowers, and whitish berries and that causes a rash on contact.
2. A skin rash caused by contact with this plant. In both senses also called poison oak.
Common urushiol-rich plants Poison ivy (Toxicodendron radicans, eastern US) poison oak (T diversilobium or Rhus diversiloba, western US), poison sumac (T vernix, southern US)
Public health A popular term for any allergic reaction or dermatopathy caused by T radicans, as in ‘Bob has poison ivy’
1. A plant that is highly allergenic due to urushiol, which is also found in mango, japanese lacquer tree, cashews; common urushiol-rich plants: poison ivy–Toxicodendron radicans, eastern US, poison oak–T diversilobium or Rhus diversiloba, western US; poison sumac–T vernix, southern US. See Urushiol.
2. A popular term for any allergic reaction or dermatopathy caused by T radicans.
poi·son i·vy, poison oak , poison sumac (poy'zŏn ī'vē, ōk, sūmak)
1. See: Toxicodendron
2. Common name for the cutaneous eruption caused by contact with these species of Toxicodendron.