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1. An abnormal brushlike growth of closely clustered shoots or twigs on a plant, often caused by a fungus or virus.
2. Any of various plant diseases characterized by such growths, especially a destructive fungal disease of cacao caused by the basidiomycetous fungus Crinipellis perniciosa.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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|Noun||1.||witches' broom - an abnormal tufted growth of small branches on a tree or shrub caused by fungi or insects or other physiological disturbance|
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