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poison oak

noun

  1. either of two shrubs, Rhus toxicodendron, of the eastern United States, or R. diversiloba, of the Pacific coast of North America, resembling poison ivy and causing severe dermatitis when touched by persons sensitive to them.


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
  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


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Word History and Origins

Origin of poison oak1

An Americanism dating back to 1735–45
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Example Sentences

“In 20 years, it’s very likely vegetation that thrives in hot and dry conditions, like poison oak, will see its growing range expand at the expense of plants that have an affinity for wetter, more sheltered site conditions,” Lee said.

The true poison oak is the Rhus diversiloba of the Western States.

The sun had not yet climbed the wooded ridges beyond Poison Oak Ranch.

Just because we use a poison-oak leaf for our brand—why, that's what got 'em to callin' us the Poison Oakers.

The poison oak had turned from green to brilliant red, and now was dark-green once more.

And—and when we're—married, you won't take me away from the Poison Oak Country, will you, dear!

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poison ivypoisonous