Any of various shrubs or small trees of the genus Rhus, having compound leaves, clusters of small greenish flowers, and usually red, hairy fruit. Some species, such as the poison ivy and poison oak, cause an acute itching rash on contact.
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.