hyperplasia
/ˌhaɪpəˈpleɪzjə/noun
mass noun
- Medicine & Biology the enlargement of an organ or tissue caused by an increase in the reproduction rate of its cells, often as an initial stage in the development of cancer【医, 生】（器官, 组织）增生, 增殖, 数量性肥大（常为癌症初期症状）。
词源
mid 19th cent.: from HYPER- 'beyond' + Greek plasis 'formation'.