Noun poison oak has 2 senses
  1. poison oak - dermatitis resulting from contact with a poison oak plant
    --1 is a kind of
    Rhus dermatitis
  2. poison ivy, markweed, poison mercury, poison oak, Toxicodendron radicans, Rhus radicans - 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
    --2 is a kind of poisonous plant
    --2 is a member of Toxicodendron, genus Toxicodendron
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