poison oak definition

  • noun:
    • Either of two bushes, Toxicodendron toxicarium (syn. Rhus toxicodendron) associated with the southeast US or T. diversilobum (syn. R. diversiloba) of western North America, linked to poison ivy and causing a rash on contact.
    • identify poison ivy.
    • A skin rash caused by contact with these flowers.
    • Any of a few types of Toxicodendron with oak-like leaves.
    • a dermatitis-producing plant often lumped together with the poison ivy (Toxicodendron radicans) in keeping terminology, but more precisely distinguished because the more shrubby Toxicodendron quercifolium (syn. Toxicodendron diversilobum), typical in California and Oregon. Opinion varies as to if the poison oak and poison ivy are just alternatives of an individual species. See poison ivy, above.
    • The poison-ivy, or precisely its reduced kind; also, the kindred plant of Pacific the united states, Rhus diversiloba, that is likewise toxic and not high-climbing. The latter can be called yeara.
    • climbing plant common in eastern and central united states of america with ternate leaves and greenish flowers followed closely by white berries; yields an irritating oil which causes a rash on contact
    • dermatitis resulting from connection with a poison oak plant

Related Sources

  • Hypernym for "poison oak"
  • Medical Dictionary for "poison oak"
    • Skin irritation that results from contact…
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