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Poison oak

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Poison Oak
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poison oak

 
Use Poison oak in a Sentence
–noun
either 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.

Origin:
1735–45, Americanism
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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Poison Oak
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Poison oak
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poison ivy  
n.   In both senses also called poison oak.

  1. A North American shrub or vine (Toxicodendron radicans syn. Rhus radicans) that has compound leaves with three leaflets, small green flowers, and whitish berries and that causes a rash on contact.

  2. A skin rash caused by contact with this plant.

poison oak  
n.  

  1. Either of two shrubs, Toxicodendron toxicarium (syn. Rhus toxicodendron) of the southeast United States or T. diversilobum (syn. R. diversiloba) of western North America, related to poison ivy and causing a rash on contact.

  2. See poison ivy.

  3. A skin rash caused by contact with one of these plants.

The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Medical Dictionary

Main Entry: poison oak
Pronunciation: -'Ok
Function: noun
1 : any of several plants included in the genus Rhus or sometimes in the genusToxicodendron that produce an irritating oil like that of poison ivy: a : a bushy plant (R. diversiloba syn. T. diversilobum) of the Pacific coast b : a bushy plant (R. toxicodendron syn. T. pubescens) of the southeastern U.S.
2 : POISON IVY1a
3 : a skin rash produced by poison oak
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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Medical Dictionary

poison oak n.

  1. Either of two shrubs, Rhus toxicodendron of the southeast United States or R. diversiloba of western North America, related to poison ivy and causing a rash on contact.

  2. See poison ivy.

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