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dieback

[dahy-bak]
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noun Plant Pathology.
  1. a condition in a plant in which the branches or shoots die from the tip inward, caused by any of several bacteria, fungi, or viruses or by certain environmental conditions.
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Origin of dieback

An Americanism dating back to 1885–90; die1 + back2
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for dieback

dieback

noun
  1. a disease of trees and shrubs characterized by death of the young shoots, which spreads to the larger branches: caused by injury to the roots or attack by bacteria or fungi
  2. any similar condition of herbaceous plants
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verb die back
  1. (intr, adverb) (of plants) to suffer from dieback
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012