calcification
  石灰化
  cal·ci·fi·ca·tion /ˌkælsəfəˈkeʃən/ 名詞
  鈣化,骨化
  Cal·ci·fi·ca·tion n. Physiol. The process of change into a stony or calcareous substance by the deposition of lime salt; -- normally, as in the formation of bone and of teeth; abnormally, as in calcareous degeneration of tissue.
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  calcification
       n 1: a process that impregnates something with calcium (or
            calcium salts)
       2: tissue hardened by deposition of lime salts
       3: an inflexible and unchanging state; "the calcification of
          negotiations"