os·si·fy /ˈɑ:səˌfaɪ/ verb os·si·fies; os·si·fied; os·si·fy·ing
1 formal + disapproving :
to become or to cause something to become unable to change [no obj
] ▪ Her opinions have ossified.
] ▪ an ossified social hierarchy ▪ ossified ideologies
2 technical :
to become or to cause something to become hard like bone [no obj
] ▪ The cartilage will ossify, becoming bone.
] ▪ a disease that ossifies the joints
— os·si·fi·ca·tion /ˌɑ:səfəˈkeɪʃən/ noun
▪ intellectual ossification ▪ ossification of the cartilage