Definition of "crown gall" []

• A widespread disease of numerous plants caused by the bacterium Agrobacterium tumefaciens and characterized by formation of galls especially at the junction of root and stem. (noun)

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.