a poisonous, irritant liquid, CHO, present in poison ivy, poison sumac, etc.
Origin of urushiolJapanese urushi, lac tree, lacquer + -ol: coined (1907) by Toshiyuki Mashima, who isolated it
A toxic substance composed of catechol derivatives that is present in the sap of various plants of the family Anacardiaceae and especially the genus Toxicodendron, including poison ivy, poison sumac, and the lacquer tree, from which a durable lacquer is obtained.
Origin of urushiolJapanese urushi, lacquer + –ol1.
From Japanese ã†ã‚‹ã— (urushi, “lacquer") +"Ž -ol