crown gall
noun
mass noun
1- a bacterial disease of plants, especially fruit bushes and trees, which is characterized by large tumour-like galls on the roots and lower trunk（植物的）冠瘿病, （细菌性）根癌病。
1.1
- This disease is caused by the soil bacterium Agrobacterium tumefaciens.该疾病由土壤中的根癌农杆菌（拉丁名Agrobacterium tumefaciens）引起。
1.2
- count noun a gall of this type冠瘿病肿瘤。