n.
Pronunciation: yu ̇ - ' rü-sh ē - ˌ o ̇ l, u ̇ - ' , - ˌ ō l
Function: noun
Etymology: International Scientific Vocabulary, from Japanese urushi lacquer + International Scientific Vocabulary 1 -ol
Date: 1908
: a mixture of catechol derivatives with saturated or unsaturated side chains of 15 or 17 carbon atoms that is an oily toxic irritant principle present in poison ivy and some related plants (genus Rhus ) and in lacquers derived from such plants