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- (organic chemistry) An oil found in plants of the family Anacardiaceae, causing an allergic skin rash on contact; consists of a variable mixture of several related organic compounds.
- 1986, Francine Brown, Skin Care:
- All three produce an oil, called urushiol, that is a potent allergen. Urushiol is most abundant in the leaves and stems of these plants...
- 1993, Jacquelyn G. Black, Microbiology: principles and applications
- Poison ivy vines also contain the irritating oil urushiol, so it is important to be able to recognize them in winter.
- 2000, C. Franklin Goldsmith, Shannon E. G. Hamrick, H. James Hamrick, The Best Hikes of Pisgah National Forest
- Upon exposure to air, urushiol can turn dark brown, which makes it easier to spot.
oil causing allergic rash
urushiol n (uncountable)
urushiol m (plural urushioles)