noun Date: 1881 an abnormal tufted growth of small branches on a tree or shrub caused especially by parasitic organisms (as fungi, viruses, or aphids)
WITCHES'-BROOM
Meaning of WITCHES'-BROOM in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012