witches broom

witches'-broom

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

Origin:
1865–70

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World English Dictionary
witches'-broom, witchbroom or witches'-besom (ˈwɪtʃˌbruːm)
 
n
a dense abnormal growth of shoots on a tree or other woody plant, usually caused by parasitic fungi of the genus Taphrina
 
witchbroom, witchbroom or witches'-besom
 
n
 
witches'-besom, witchbroom or witches'-besom
 
n

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