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poison oak
noun
- 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
- 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
- not in technical use another name for poison ivy
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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
The true poison oak is the Rhus diversiloba of the Western States.
From Project Gutenberg
The sun had not yet climbed the wooded ridges beyond Poison Oak Ranch.
From Project Gutenberg
Just because we use a poison-oak leaf for our brand—why, that's what got 'em to callin' us the Poison Oakers.
From Project Gutenberg
The poison oak had turned from green to brilliant red, and now was dark-green once more.
From Project Gutenberg
And—and when we're—married, you won't take me away from the Poison Oak Country, will you, dear!
From Project Gutenberg
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