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witches' broom

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witch⋅es'-broom

[wich-iz-broom, -broom]
–noun Plant Pathology.
an abnormal, brushlike growth of small thin branches on woody plants, caused esp. by fungi, viruses, and mistletoes.

Origin:
1865–70
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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witches' broom  
n.  An abnormal brushlike growth of weak, closely clustered shoots or branches on a tree, such as the hackberry, caused by fungi or viruses.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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