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poison ivy

a vine or shrub, Rhus radicans, having trifoliate leaves and whitish berries and causing severe dermatitis when touched by persons sensitive to it.
the rash caused by touching poison ivy.
Origin of poison ivy
An Americanism dating back to 1775-85 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for poison ivy
Contemporary Examples
Historical Examples
  • They also eat small seeds, particularly those of the poison ivy.

    Checking the Waste Mary Huston Gregory
  • It was far worse than poison ivy, for it began to eat into his flesh.

    Woodland Tales Ernest Seton-Thompson
  • Then theres Fleming, with whom Im just about as popular as poison ivy.

    Baseball Joe, Home Run King

    Lester Chadwick
  • For example, the poison ivy is extremely poisonous to touch.

    A Civic Biology George William Hunter
  • Betsey Graymouse, here is Buster with his paws full of poison ivy!

    Grand-Daddy Whiskers, M.D. Nellie M. Leonard
  • Most bachelors regard the "flower of love" as a species of poison ivy.

    A Guide to Men Helen Rowland
  • It was in a mass of poison ivy that had climbed up on a scrub-oak.

    A-Birding on a Bronco Florence A. Merriam
  • Alcohol, of course, is good for poison ivy, but whisky is better.

    The Tent Dwellers Albert Bigelow Paine
  • There was poison ivy there, too, and a delegation of mosquitoes.

    The Tent Dwellers Albert Bigelow Paine
British Dictionary definitions for poison ivy

poison ivy

any of several North American anacardiaceous shrubs or vines of the genus Rhus (or Toxicodendron), esp R. radicans, which has small green flowers and whitish berries that cause an itching rash on contact See also sumach (sense 1)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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poison ivy in Medicine

poison ivy n.
A North American shrub or vine that has compound leaves with three leaflets, small green flowers, and whitish berries and that causes a rash on contact. Also called poison oak.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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