Dictionary![]() ![]() u•ru•shi•olPronunciation: (oo-rOO'shē-ôl", -ol"), [key] —n. a toxic, liquid, catechol derivative, the active irritant principle in several species of the plant genus Rhus, as in poison ivy. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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