urushiol

[u-roo´she-ol]

the toxic irritant principle of poison ivy and related plants.

u·ru·shi·ol

(ū-rū'shē-ōl),

A mixture of nonvolatile hydrocarbons, derivatives of catechol with unsaturated C₁₅ or C₁₇ side chains, constituting the active allergen of the irritant oil of poison ivy, Toxicodendron radicans, poison oak, T. diversilobum, and the Asiatic laquer tree, T. verniciferum.

[Jap. urushi, lac, + L. oleum, oil]

Farlex Partner Medical Dictionary © Farlex 2012

urushiol

(o͝o-ro͞o′shē-ôl′, -ōl′, -ŏl′)

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.

ur·u·shi·ol

(ū-rū'shē-ōl)

A mixture of nonvolatile hydrocarbons, constituting the active allergen of the irritant oil of poison ivy, Toxicodendron radicans, poison oak, T. diversilobum, and the Asiatic laquer tree, T. verniciferum.

[Jap. urushi, lac, + L. oleum, oil]

Medical Dictionary for the Health Professions and Nursing © Farlex 2012

Mentioned in

References in periodicals archive

This lacquer sap has slow drying speed [7, 8] compared with urushiol, under 60%-80% humidity environment via enzyme-catalyzed reaction [6].

Synthesizing Radiation-Hard Polymer and Copolymers Using Laccol Monomers Extracted From Lacquer Tree Toxicodendron succedanea via Cationic Polymerization

Since urushiol is an allergen, medical folks refer to the skin rash as an allergic contact dermatitis.

'Leaves of three, let it be'

succedanea) is composed of urushiol, glycoprotein, flavonoids, a gummy substance that contains laccase, stellacyanin, polysaccharides, peroxidase, and water [23].

In vitro evaluation of Rhus succedanea extracts for ruminants

A little bit of urushiol goes a long way; enough to coat the head of a pin can have up to 500 people scratching in misery.

Ditch the itch: learn what you need to know to avoid the undesirable poison ivy rash, and it'll never deter you from the outdoors again

Symptoms usually occur within the first 4 days of exposure, with lesions cropping up at different times depending on the location and type of skin and intensity of exposure to urushiol. Lesions are typically very itchy and can be plaques, papules, vesicles, or bullae.

Practical parenting: poison plants

It is not just the leaves that can provoke a reaction; the stems, roots, flowers and berries all contain urushiol.

Steering clear of poison ivy

In one study, antibacterial activity of the urushiol, major component of the remedy against Helicobacter pylori (H.

Integrating traditional medicine into modern inflammatory diseases care: multitargeting by Rhus verniciflua stokes

than feel urushiol's war galleys row across my leg, galling

Poison Oak

Poison ivy, poison oak, and poison sumac are plants that contain an irritating, oily sap called urushiol. It triggers an allergic reaction when it comes into contact with skin resulting in an itchy rash, which can appear within hours of exposure or up to several days later

Allergies AN OVERVIEW

It is estimated that half the population is sensitized to the allergen, urushiol, and would have a reaction if they came into contact with any of these plants.

Poisonous plants