What does poison oak mean?
• POISON OAK (noun) The noun POISON OAK has 2 senses: 1. dermatitis resulting from contact with a poison oak plant 2. climbing plant common in eastern and central United States with ternate leaves and greenish flowers followed by white berries; yields an irritating oil that causes a rash on contact Familiarity information: POISON OAK used as a noun is rare.