Cite
 

Meaning of witches'-broom

witch•es'-broom

Pronunciation: (wich'iz-brm", -broom"), [key]
— n. Plant Pathol.
  1. an abnormal, brushlike growth of small thin branches on woody plants, caused esp. by fungi, viruses, and mistletoes.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.