poison ivy

noun

a vine or shrub, Rhus radicans, having trifoliate leaves and whitish berries and causing severe dermatitis when touched by persons sensitive to it.
poison oak.
the rash caused by touching poison ivy.

Origin of poison ivy

An Americanism dating back to 1775–85

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for poison ivy

Historical Examples of poison ivy

She leaped to her feet and fought them wildly with her branch of poison-ivy.
IT and Other Stories
Gouverneur Morris
The hand in which she had held the poison-ivy was beginning to itch and swell.
IT and Other Stories
Gouverneur Morris
Poison-ivy vines often are hidden in long grass and in foliage.
North Dakota
Various
Do poison-ivy and Virginia creeper belong to the same family?
A Little Garden Calendar for Boys and Girls
Albert Bigelow Paine
I'd thought of poison-ivy or some kind of plant they'd been grubbing at.
Average Jones
Samuel Hopkins Adams

British Dictionary definitions for poison ivy

poison ivy

noun

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 contactSee also sumach (def. 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

poison ivy in Medicine

poison ivy

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.poison oak