Poison Ivy

Poison Ivy.

Toxicodendron radicans

Poison Ivy (Wiktionary)



poison ivy (countable and uncountable, plural poison ivies)

  1. Any of three ivy-like species of Toxicodendron, known for their ability to cause an itching rash and blistering for most people, through urushiol, an oil that is a skin irritant.

Usage notes

The name is often spelled "poison-ivy" to indicate that it is not a true ivy or Hedera.


  • (ivy-like plant producing skin irritant): Toxicodendron orientale (Asian poison ivy), Toxicodendron radicans (eastern poison ivy), Toxicodendron rydbergii (western poison ivy)


See also

  • leaves of three, let it be
  • poison oak
  • poison sumac
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