poison oak
From Wiktionary, the free dictionary
Etymology
Its leaves resemble those of the true oaks, and the leaves and twigs contain urushiol, which can cause allergic reactions.
Noun
poison oak (usually uncountable, plural poison oaks)
- Any of the species of Toxicodendron with compound leaves having three oak-like leaflets, native to North America.
Hyponyms
Further reading
Toxicodendron on Wikipedia.Wikipedia 
Toxicodendron on Wikispecies.Wikispecies 
Toxicodendron pubescens on Wikimedia Commons.Wikimedia Commons - Toxicodendron diversilobum on Wikimedia Commons.Wikimedia Commons
- poison oak at USDA Plants database (T. pubescens)
- poison oak at USDA Plants database (T. diversilobum)
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