ossification
noun [ U ] uk/ˌɒs.ɪ.fɪˈkeɪ.ʃən/ us/ˌɑːs.ə.fəˈkeɪ.ʃən/
(of ideas)
（习惯或思想的）僵化
the process of habits or ideas becoming fixed and unable to change
the ossification of his thought processes as he grew older 随着年纪增长他思想的越发僵化
(in body)
medical specialized骨化
the process of becoming hard and changing into bone