Meaning of poison ivy

poi'son i'vy

Pronunciation: [key]
  1. a vine or shrub, Rhus radicans, having trifoliate leaves and whitish berries and causing severe dermatitis when touched by persons sensitive to it.
  2. See
  3. the rash caused by touching poison ivy.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.