WordReference Random House Unabridged Dictionary of American English © 2026
poi′son oak′, 
  1. Plant Biologyeither of two shrubs, Rhus toxicodendron, of the eastern U.S., or R. diversiloba, of the Pacific coast of North America, resembling poison ivy and causing severe dermatitis when touched by persons sensitive to them. Also called poison ivy. 
  • 1735–45, American.

'poison oak' also found in these entries (note: many are not synonyms or translations):
oak - poison ivy

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