Meaning of urushiol

u•ru•shi•ol

Pronunciation: (oo-r'shē-ôl", -ol"), [key]
— n.
  1. 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.