Webster's English Dictionary

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ossification

os.si.fi.ca.tion \.a:s-(*-)f*.-ka--sh*n\ \a:-'sif-i-k*-.to-r-e-, 
   'a:s-(*-)fi-, -.to.r-\ n 1a: the natural process of bone formation  1b: the 
   hardening (as of muscular tissue) into a bony substance  2: a mass or 
   particle of ossified tissue  3: a tendency toward or state of being callous 
   or conventional in outlook  - os.si.fi.ca.to.ry aj