Definition of urushiol
: a mixture of catechol derivatives with saturated or unsaturated side chains of 15 or 17 carbon atoms that is an oily toxic irritant substance present in poison ivy and some related plants (such as poison oak and poison sumac)
Recent Examples of urushiol from the Web
Remember that urushiol can cling to surfaces and be transferred to skin.
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Origin and Etymology of urushiol
International Scientific Vocabulary, from Japanese urushi lacquer + International Scientific Vocabulary 1-ol
First Known Use: 1908See Words from the same year
Medical Definition of urushiol
: a mixture of pyrocatechol derivatives with saturated or unsaturated side chains of 15 or 17 carbon atoms that is an oily toxic irritant principle present in poison ivy and some related plants of the genus Rhus
Learn More about urushiol
Britannica.com: Encyclopedia article about urushiol
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