ossifying

/AA1 S AH0 F AY0 IH0 NG/
verb
  1. 1

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

  2. 2

    (animate) To become (or cause to become) inflexible and rigid in habits or opinions.

  3. 3

    (inanimate) To grow (or cause to grow) formulaic and permanent.

  4. 4

    To calcify.

Synonyms

Source: https://en.wiktionary.org/wiki/ossify, https://en.wiktionary.org/wiki/ossifying