poison-ivy

See also: poison ivy

English

Etymology

From poison +‎ ivy.

Noun

poison-ivy (uncountable)

  1. A woody vine plant in the family Anacardiaceae (Toxicodendron radicans or Rhus toxicodendron), well-known for its ability to produce urushiol, a skin irritant that causes an itching rash for most people.

Usage notes

Although usually written as poison ivy, the name is often spelled "poison-ivy" to indicate that it is not a true Ivy or Hedera.

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