western poison oak

noun

A vine or small shrub native to western North America, Toxicodendron diversilobum, which exudes a toxic oil containing urushiol that causes a skin rash.

Similar
Toxicodendron diversilobumRhus diversiloba
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Meanings

nounwestern poison oak (plural western poison oaks)

plural western poison oaks

  1. A vine or small shrub native to western North America, Toxicodendron diversilobum, which exudes a toxic oil containing urushiol that causes a skin rash.

Synonyms & antonyms

nounpoisonous shrub of the Pacific coast of North America that causes a rash on contact

Similar
Toxicodendron diversilobumRhus diversiloba
Broader
poisonous plant

Synonym sets from Open English WordNet, CC BY 4.0.

Origin

From western + poison oak.

Full word history & related roots →
Cite this entry
APA

western poison oak. (n.d.). In WatkinsX Dictionary. Retrieved November 5, 2026, from https://dictionary.watkinsx.com/word/western%20poison%20oak

MLA

“western poison oak.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/western%20poison%20oak. Accessed November 5, 2026.

Chicago

WatkinsX Dictionary, s.v. “western poison oak,” accessed November 5, 2026, https://dictionary.watkinsx.com/word/western%20poison%20oak.

Source: western poison oak on Wiktionary, CC BY-SA 4.0.