poison oak

1. Either of two shrubs, Toxicodendron toxicarium (syn. Rhus toxicodendron) of the southeast United States or T. diversilobum (syn. R. diversiloba) of western North America, related to poison ivy and causing a rash on contact.
2. See poison ivy.
3. A skin rash caused by contact with one of these plants.

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1. Either of two shrubs, Rhus toxicodendron of the southeast United States or R. diversiloba of western North America, related to poison ivy and causing a rash on contact.
2. See poison ivy.

The noun has 2 meanings:

Meaning #1: dermatitis resulting from contact with a poison oak plant

Meaning #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: poison ivy, markweed, poison mercury, Toxicodendron radicans, Rhus radicans

Poison oak may refer to:

• Toxicodendron diversilobum, grows on West Coast of North America
• Toxicodendron pubescens, grows in the Eastern United States

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