ossify

verb4

1. •
   To transform (or cause to transform) from a softer animal substance into bone; particularly the processes of growth in humans and animals.

   • […], nor do all bones of the same skeleton ossify during the samе period of time. — 1884
2. •
   To become (or cause to become) inflexible and rigid in habits or opinions.

   • Before long, the entire organization ossifies. — 1996
3. •
   To grow (or cause to grow) formulaic and permanent.

   • This accidental repartition gets repeated, develops advantages of its own, and gradually ossifies into a systematic division of labour. — 1886
4. •
   To calcify.

   • The cartilages become brittle, and in many instances are ossified; the ligaments are rendered harder, but are less capable of resisting extension. — 1850