Try Our Apps
Dictionary.com

follow Dictionary.com

The Word of the Year is...

poison oak

noun
1.
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 of poison oak
1735-1745
1735-45, Americanism
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
Cite This Source
Examples from the Web for poison oak
Historical Examples
British Dictionary definitions for poison oak

poison oak

noun
1.
either of two North American anacardiaceous shrubs, Rhus toxicodendron or R. diversiloba, that are related to the poison ivy and cause a similar rash See also sumach (sense 1)
2.
(not in technical use) another name for poison ivy
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
Cite This Source
poison oak in Medicine

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.
Cite This Source

Word of the Day

Difficulty index for poison oak

Few English speakers likely know this word

Word Value for poison

8
10
Scrabble Words With Friends

Nearby words for poison oak