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.
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 (sense 1)
(not in technical use) another name for poison ivy
poison oak n.
[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. […]
[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 […]
noun 1. a pellet of a quick-acting poison, as cyanide, for a spy to carry in order to commit suicide when faced with capture or torture. 2. Financial Slang. any of various business devices created to prevent a company from being taken over by another, as issuing a new class of stock or stock warrants […]