Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio.
a disease of vascular plants characterized by a dying backward from the tip of twigs and branches and caused by parasites, insufficient moisture, etc.
Used by arrangement with John Wiley & Sons, Inc.
The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
The gradual dying of plant shoots, starting at the tips, as a result of various diseases or climatic conditions.