from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A toxic substance present in the resin or on the surface of plants of the genus Rhus, including poison ivy and the lacquer tree, from which a black Japanese lacquer is obtained.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. 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.
Japanese urushi, lacquer + -ol1.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Japanese うるし (urushi, "lacquer") + -ol (Wiktionary)