Definitions for urushiolʊˈru ʃiˌɔl, -ˌɒl
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Random House Webster's College Dictionary
u•ru•shi•olʊˈru ʃiˌɔl, -ˌɒl(n.)
a catechol derivative that is the irritant in poison ivy and its allies.
Category: Pharmacology
Origin of urushiol:
1910–15; < Japn urushi lacquer
Wiktionary
urushiol(Noun)
An oil found in plants of the family Anacardiaceae, causing an allergic skin rash on contact; consists of a variable mixture of several organic compounds.
Origin: From うるし
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