urushiol

[ oo-roo-shee-awl, -ol ]
/ ʊˈru ʃiˌɔl, -ˌɒl /

noun

a toxic, liquid, catechol derivative, the active irritant principle in several species of the plant genus Rhus, as in poison ivy.

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Origin of urushiol

1910–15; <Japanese urushi lacquer + -ol1

Words nearby urushiol

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for urushiol

urushiol
/ (ˈuːrʊʃɪˌɒl, uːˈruː-) /

noun

a poisonous pale yellow liquid occurring in poison ivy and the lacquer tree

Word Origin for urushiol

from Japanese urushi lacquer + -ol ²
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medical definitions for urushiol

urushiol
[ u-rōōshē-ôl′, -ōl′ ]

n.

A toxic substance constituting the active allergen of the irritant oil present in poison ivy, poison oak, and poison sumac.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Scientific definitions for urushiol

urushiol
[ u-rōōshē-ôl′, -ōl′ ]

A toxic substance present in the resin or on the surface of plants of the genus Rhus (syn. Toxicodendron). Urushiol is a mixture of several derivatives of catechol and is the irritating substance in poison ivy.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.