poison oak

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poison oak

1. Either of two plants, Toxicodendron pubescens, a shrub of the southeast United States, or T. diversilobum, a shrub or vine of western North America, having compound leaves with three lobed or toothed leaflets, and causing a rash on contact.

2. See poison ivy.

3. A skin rash caused by contact with one of these plants.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

poison oak

1. (Plants) either of two North American anacardiaceous shrubs, Rhus toxicodendron or R. diversiloba, that are related to the poison ivy and cause a similar rash. See also sumach¹

2. (Plants) (not in technical use) another name for poison ivy

Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

poi′son oak′

either of two North American shrubs of the cashew family, Rhustoxicodendron, of the eastern U.S., or R.diversiloba, of the Pacific coastal area, with leaves resembling those of poison ivy: may cause allergic dermatitis when touched.

[1735–45, Amer.]

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Noun	1.	poison oak - dermatitis resulting from contact with a poison oak plant Rhus dermatitis - contact dermatitis resulting from contact with plants of the genus Toxicodendron
	2.	poison oak - climbing plant common in eastern and central United States with ternate leaves and greenish flowers followed by white berries; yields an irritating oil that causes a rash on contact markweed, poison mercury, Rhus radicans, Toxicodendron radicans, poison ivy genus Toxicodendron, Toxicodendron - in some classifications: comprising those members of the genus Rhus having foliage that is poisonous to the touch; of North America and northern South America poisonous plant - a plant that when touched or ingested in sufficient quantity can be harmful or fatal to an organism

Translations

poison oak

n (bot) roble venenoso

References in classic literature ?

It seemed as if all local varieties of trees and vines had conspired to weave the leafy roof--maples, big madronos and laurels, and lofty tan-bark oaks, scaled and wrapped and interwound with wild grape and flaming poison oak. Saxon drew Billy's eyes to a mossy bank of five-finger ferns.

View in context

According to Poison-Ivy.org, a website which also provided information about poison oak and poison sumac, the rash from poison ivy may first appear as just a slight itchy spot.

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If you are, you're probably also sensitive to poison sumac and poison oak. Only about 15% of people who are sensitive to poison ivy will experience a severe reaction.

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However, for the often sole female, urination meant breaking away from the file, finding a private location away from curious eyes, unbuckling and dropping your 70-pound rucksack strategically near a strong looking tree trunk, visually clearing the target area for possible poison oak and ivy (very important in Ontario!), undressing, exposing and then relieving yourself.

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According to Tec Labs, Smith's wife, Evelyn, accidentally discovered that Tecnu would cleanse poisonous plant oils after she was exposed to poison oak in the family's backyard.

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While some common, acute exposure-related ACD can be straightforward to diagnose, such as poison ivy and poison oak, other exposure-related ACD can be more difficult, especially as the "culprits" vary over time.

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* Poison ivy, poison oak, and poison sumac contain oils that cause rashes to appear in 12 to 72 hours after contact.

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Clinical Repair Cream is ideal for those suffering from dry, itchy skin and Extra Strength Spray is formulated for use on contagious or hard-to-reach areas, such as rashes from poison oak or ivy.