All three produce an oil, called urushiol, that is a potent allergen. Urushiol is most abundant in the leaves and stems of these plants...
Source: wiktionary
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10 translations across 9 languages.
3 total sentences available.
All three produce an oil, called urushiol, that is a potent allergen. Urushiol is most abundant in the leaves and stems of these plants...
Source: wiktionary
Poison ivy vines also contain the irritating oil urushiol, so it is important to be able to recognize them in winter.
Source: wiktionary
Upon exposure to air, urushiol can turn dark brown, which makes it easier to spot.
Source: wiktionary
Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.