poison oak

poison oak

n.

1. Either of two shrubs, Toxicodendron toxicarium (syn. Rhus toxicodendron) of the southeast United States or T. diversilobum (syn. R. diversiloba) of western North America, related to poison ivy and causing a rash on contact.

2. See poison ivy.

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

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poison oak

n

1. (Life Sciences & Allied Applications / 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 sumach [1]

2. (Life Sciences & Allied Applications / Plants) (not in technical use) another name for poison ivy

Thesaurus

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