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a vine or shrub, Rhus radicans, having trifoliate leaves and whitish berries and causing severe dermatitis when touched by persons sensitive to it.
the rash caused by touching poison ivy.
any of several North American anacardiaceous shrubs or vines of the genus Rhus (or Toxicodendron), esp R. radicans, which has small green flowers and whitish berries that cause an itching rash on contact See also sumach (sense 1)

poison ivy n.
A North American shrub or vine that has compound leaves with three leaflets, small green flowers, and whitish berries and that causes a rash on contact. Also called poison oak.


Read Also:

  • Poison-oak

    noun 1. either of two shrubs, Rhus toxicodendron, of the eastern U.S., or R. diversiloba, of the Pacific coast of North America, resembling poison ivy and causing severe dermatitis when touched by persons sensitive to them. noun 1. either of two North American anacardiaceous shrubs, Rhus toxicodendron or R. diversiloba, that are related to the […]

  • Poisonous

    [poi-zuh-nuh s] /ˈpɔɪ zə nəs/ adjective 1. full of or containing : poisonous air; a poisonous substance. 2. harmful; destructive: poisonous to animals; poisonous rumors. 3. deeply malicious; malevolent: poisonous efforts. /ˈpɔɪzənəs/ adjective 1. having the effects or qualities of a poison 2. capable of killing or inflicting injury; venomous 3. corruptive or malicious adj. […]

  • Poison-pen

    [poi-zuh n-pen] /ˈpɔɪ zənˈpɛn/ adjective 1. composed or sent maliciously, as a letter, usually anonymously and for the purpose of damaging another’s reputation or happiness: The newspaper received a poison-pen letter alleging that the mayor was misusing city funds. 2. characterized by or given to the sending of poison-pen letters: a poison-pen campaign; a poison-pen […]

  • Poison-pen letter

    noun 1. a letter written in malice, usually anonymously, and intended to abuse, frighten, or insult the recipient noun phrase A malicious anonymous letter; an obscene crank letter (1929+) A letter, usually anonymous, that makes malicious statements about the recipient or a third party. For example, She told the police about the poison-pen letters, but […]

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