Poison ivy
: Skin inflammation resulting from contact with oils from the poison ivy vine. Chemicals produced by this vine cause an immune reaction, producing redness, itching, and blistering of the skin. Poison ivy (Rhus radicans) is a woody shrub or vine. It is found throughout the US and many other areas of the world. Red-tinged leaves grow in groups of three. The leaves may have smooth, fine-toothed, or lobed margins. The allergen in poison ivy is predominantly 3-n-pentadecylcatechol. It is found in the resinous sap material produced by the leaves, fruit, stem, and bark. Poison ivy is usually considered a summer problem in the US but it can and does occur year-round. Treatment usually involves topical medication, such as calamine lotion, but in severe cases cortisone medications are

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poison ivy -'ī-vē n
1 a) a climbing plant of the genus Rhus (R. radicans syn. Toxicodendron radicans) that is esp. common in the eastern and central U.S., that has leaves in groups of three, greenish flowers, and white berries, and that produces an acutely irritating oil causing a usu. intensely itching skin rash
b) any of several plants closely related to poison ivy esp POISON OAK (1b)
2) a skin rash produced by poison ivy

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poi·son ivy (poiґzən iґve) Rhus radicans.

Medical dictionary. 2011.

Look at other dictionaries:

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  • poison ivy — n [U] a North American plant that has an oily substance on its leaves that makes your skin hurt and ↑itch if you touch it …   Dictionary of contemporary English

  • poison ivy — noun uncount a plant of the eastern U.S. that makes your skin red and painful if you touch it …   Usage of the words and phrases in modern English

  • poison ivy — ☆ poison ivy n. 1. any of several woody vines or shrubs (genus Rhus, esp. R. radicans), of the cashew family, having leaves of three leaflets, greenish flowers, and ivory colored berries: it can cause a severe rash on contact 2. a rash or… …   English World dictionary

  • Poison ivy — taxobox name = Toxicodendron radicans regnum = Plantae unranked divisio = Angiosperms unranked classis = Eudicots unranked ordo = Rosids ordo = Sapindales familia = Anacardiaceae genus = Toxicodendron species = T. radicans binomial =… …   Wikipedia

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