poison oak


Definition of poison oak

1 : any of several plants related to poison ivy and producing an oil with similar irritating properties: such as
a : a bushy plant (Toxicodendron diversilobum synonym Rhus diversiloba) of the Pacific coast
b : a bushy plant (Toxicodendron toxicarium synonym Rhus toxicodendron) chiefly of the southeastern U.S.

Examples of poison oak in a Sentence

Recent Examples on the Web There are the unlikely megahazards—mountain lions and bears—but also a whole host of lesser dangers that can ruin a hike: cactus spines, poison oak, and skunks. Sunset Magazine, "Hitting the Trail with the Kids," 29 Sep. 2020 Injuries include sprains, burns, smoke inhalation, eye irritations, heat exhaustion, chest pain and lots of poison oak, the nurses said. Tatiana Sánchez, SFChronicle.com, "As California blazes rage, travel nurses fill critical need at fire camps," 20 Sep. 2020 Unfortunately, there are no plants that carry a guarantee against hungry deer (maybe poison oak). oregonlive, "Ask an expert: Suggestions for vining plants that may not tempt hungry deer," 6 Sep. 2020 On trails, runners are being good about standing aside to let others pass but may pay the price with poison oak. Ann Killion, SFChronicle.com, "Running in the age of coronavirus: Sidewalk etiquette hot topic in Bay Area," 2 Apr. 2020 What is the difference between poison ivy, poison sumac, and poison oak? Everyday Einstein Sabrina Stierwalt, Scientific American, "What Do Cashews, Mangoes and Poison Ivy Have in Common?," 26 Jan. 2020 While in California, police said Collins was treated for poison oak. Freep.com, "Murders of Michigan women still unsolved 50 years later — but cops had eye on 1 man," 10 Nov. 2019 Smoke from fires that burn through poison oak and poison ivy may contain traces of irritants from those plants. Eva Frederick, Science | AAAS, "What we don’t know about wildfire smoke is likely hurting us," 14 Feb. 2020 The area where the body was left was near poison oak. Freep.com, "Murders of Michigan women still unsolved 50 years later — but cops had eye on 1 man," 10 Nov. 2019

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'poison oak.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of poison oak

1739, in the meaning defined at sense 1

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Time Traveler for poison oak

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The first known use of poison oak was in 1739

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Statistics for poison oak

Last Updated

11 Oct 2020

Cite this Entry

“Poison oak.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/poison%20oak. Accessed 26 Nov. 2020.

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More Definitions for poison oak

poison oak


English Language Learners Definition of poison oak

: a common bush in the western U.S. that causes a very itchy and painful rash on your skin if you touch it

poison oak


Kids Definition of poison oak

: a bush related to poison ivy that can cause an itchy painful rash when touched

poison oak

\ -ˈōk How to pronounce poison oak (audio) \

Medical Definition of poison oak

1 : any of several plants included in the genus Rhus or sometimes in the genus Toxicodendron that produce an irritating oil like that of poison ivy:
a : a bushy plant (R. diversiloba synonym T. diversilobum) of the Pacific coast
b : a bushy plant (R. toxicodendron synonym T. pubescens) of the southeastern United States
3 : a skin rash produced by poison oak

More from Merriam-Webster on poison oak

Britannica.com: Encyclopedia article about poison oak

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