hyperplasia       
noun [ U ]  medical specialized uk/ˌhaɪ.pəˈpleɪ.ʒə/ us/ˌhaɪ.pɚˈpleɪ.ʒə/
 过度增生
an abnormal increase in the number of cells in a body tissue or organ
  Benign prostatic hyperplasia is an increase in size of the prostate. 前列腺良性增生是指前列腺变大。