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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
1775-85, Americanism Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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Examples from the Web for poison-ivy
Historical Examples
  • The poison-ivy is in its glory, and no tupelo, no sugar-maple, can rival its scarlet and vermilion.

    In the Open Stanton Davis Kirkham
  • She leaped to her feet and fought them wildly with her branch of poison-ivy.

    IT and Other Stories Gouverneur Morris
  • I suppose he's so taken up with his poison-ivy business that he can't think of anything else.

    The Adventure Club Afloat Ralph Henry Barbour
  • Do poison-ivy and Virginia creeper belong to the same family?

  • It is closely allied to the poison-ivy of the Eastern States, and very similar in its effects.

  • I'd thought of poison-ivy or some kind of plant they'd been grubbing at.

    Average Jones Samuel Hopkins Adams
  • The hand in which she had held the poison-ivy was beginning to itch and swell.

    IT and Other Stories Gouverneur Morris
  • If you do not know the poison-ivy, remember this: It is the three-leaved ivy.

    On the Trail Lina Beard and Adelia Belle Beard
  • Look at the poison-ivy, but do not touch it, and you will see it climbing over tree-trunks and fence-posts by means of rootlets.

  • I seem to picture her in the privacy of the home circle brewing a great jorum of poison-ivy tea.

    Ladies and Gentlemen
    Irvin S. (Irvin Shrewsbury) Cobb
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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